Graeme Hugo The University of Adelaide, Adelaide, South Australia, Australia

Transcription

1 bs_bs_banner DOI: /ajag Global and Regional Perspectives The changing demographics of Australia over the last 30 years Graeme Hugo The University of Adelaide, Adelaide, South Australia, Australia Keywords: aged care, ageing, demographic change. Introduction Populations are in a constant state of change, but unlike many aspects of economic, political and social change that can be sudden, demographic change is usually gradual and cumulative. Accordingly, demographic change is often overlooked by commentators and policy-makers and can creep up on them. Australia s population change is especially dynamic because international migration has been consistently more significant than in other Organisation for Economic Co-operation and Development (OECD) countries over the entire postwar period. Accordingly, in 2011, half of the number of people living in Australia consists of migrants or Australia-born children from migrants, compared with 20% in the USA, for example. Out of OECD countries for which more than 50 years of data are available, Australia s population growth is the second fastest since World War II due to international migration and a total fertility rate close to replacement level [1,2]. Yet this high rate of growth is only part of the demographic transformation that has occurred. The most dramatic changes have been in the composition of the population and these shifts have been both a cause and consequence of the substantial economic and social changes that have swept across Australia over this period. One of the most significant demographic shifts has been a significant ageing of the population, a process that is graphically evident in Figure 1, which overlays the age sex composition of the Australian population in 1981 and Ageing is a universal characteristic of all national populations [3]. However, in OECD countries, it has become not only the dominant contemporary demographic feature, but also an issue of central economic and social concern: Over the next couple of decades nothing will impact OECD economies more profoundly than demographic trends and, chief among them, ageing [4]. In Australia, similar sentiments have been expressed by the Department of Treasury [5 7] in their three-yearly Intergenerational Reports. Yet the increase in the significance of ageing in Australia was anticipated and reported much Correspondence to: Professor Graeme Hugo, University of Adelaide, Geography, Environment and Population. graeme.hugo@adelaide.edu.au earlier. In particular, the publication of Howe s [8] Towards an Older Australia and the launch of the Australian Journal on Ageing in 1982 marked the beginning of a new awareness of the rapid growth of the older population and an analysis of the 1981 population census results devoted a chapter to the Greying of Australia [9]. This paper summarises and analyses the major changes that have occurred in the Australian population between the 1981 and 2011 population censuses over the period since the launch of the Australian Journal on Ageing. The first section focuses on the pattern of population growth and the changing patterns of mortality, fertility and international migration, which have not only contributed to changing levels of population growth but have also impacted on both the changing composition and distribution of the population. In the second section, changes in the composition of the population are considered with respect to ageing, ethnicity and households. Third, changes in population spatial distribution are analysed. Finally, some of the implications of these changes for national population policy are examined and discussed briefly. Methods and data This paper relies mainly upon population census and immigration data to reflect demographic change. The quinquennial Australian census is one of the most accurate in the world with an underenumeration of only 1.7% in 2011 and an array of questions that facilitate comprehensive analysis of the changing patterns of growth in, and characteristics and location of, the Australian older population [10]. Similarly, international data are excellent [11]. There is, however, some potential for misinterpretation in a few areas of population dynamics that need to be briefly mentioned here. For example, census data on the indigenous population are on the basis of self-identification and are subject to error, which may vary between censuses. Similarly, the calculation of net migration is becoming increasingly complex in Australia with the increasing significance of temporary migration. Changing population growth The total population increased from 14.6 to 21.5 million over the period. Table 1 shows that the rate of growth varied between 1.61% per annum in to 1.05% in These rates of growth are high by high-income country standards, although somewhat slower than in the heyday of rapid growth in the early postwar decades [12]. Table 1 also shows that in every intercensal period since 1981, the growth rate of the 65+ population has considerably outpaced that of the total population with growth rates varying between almost 3% per annum in 18 Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013, 18 27

2 30 Years of changing demographics in Australia Figure 1: Australia: Age-sex distribution, 1981 and (shaded) and Age Men Women Source: Australian Bureau of Statistics, unpublished data, 1981 and 2011 censuses. Percent Table 1: Australia: Population by age and growth rate, Year Total Population Growth Rate 65+ Growth Rate of Growth Rate of Source: Australian Bureau of Statistics censuses, unpublished data, and 2% in The rates for the olderold 75+ population have been even greater except for the most recent period. Hence while the total population increased by 47.6% between 1981 and 2011, the 65+ more than doubled (110.7%) and the 75+ almost trebled (171.4%). In order to understand the dynamics of overall population growth and the reasons why the older population has grown even faster since 1981, it is necessary to examine the processes of population change. Figure 2 shows the relative contributions of natural increase (births minus deaths) and net migration (immigrants minus emigrants). It will be noticed that the contribution of natural increase has remained relatively stable over the period adding around persons net each year. Net migration, on the other hand, has been much more volatile, fluctuating with national economic trends and shifts in government policy. For example, the net migration gain spiked in , which was possibly influenced by a new method of estimating net migration introduced by the Australian Bureau of Statistics (ABS). We will now turn to examining trends in each of the demographic processes impinging on national population growth separately. First, with respect to mortality, Figure 3 shows the steep increase in life expectancy among Australians over the last century. In the period since World War II, life expectancy has increased by 12.6 years for male and 12.9 years for female Australians. Between 1981 and 2011, the increase in life expectancy was 8.3 years for men and 5.8 for women. Hence more Australians are surviving the younger years than ever Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013,

3 Graeme Hugo Figure 2: Australia: Total population growth showing the natural increase and net migration components, Table 2: Australia: Expectation of life at age 50, , , 1981 and 2011 Years Men Women Source [16 18]. Persons Net Migration Natural Increase Year Table 3: Proportion of the population with disabilities, Age group Percent All people Source [19,20]. Source: [Australian Bureau of Statistics, unpublished data, 13]. Figure 3: Australia: Expectation of life at birth, Expectations Of Life At Birth (years) Source: [9] [16]. Women Men Year Expectation of Life at Birth Men Women before. However, perhaps the biggest change has come in the older ages. Prior to 1970 we had added very few years of extra life to Australians aged 50 years or more, despite a greater likelihood to reach the age of 50. Hence, Table 2 shows that between 1901 and 1970 life expectancy increased by only 1.8 years for Australians aged 50. The increase was greater for women (4.6 years) because of the huge reduction in pregnancy/childbirth-related deaths. However the table shows that there has since been a dramatic change with 8.5 years being added to the life expectancy of Australian men aged 50 between 1970 and 2010 and 7.1 years to the life expectancy of Australian women of that age. Between 1981 and 2011, the increases were 6.8 years for men and 4.8 for women. This massive change was not anticipated by commentators at the time [14,15] and was achieved through medical breakthroughs such as better diagnosis of heart conditions, bypass operations and the development of intensive care units. In addition, major improvements in lifestyle through better diet, reduced smoking and safer cars have also had an impact. As a result, not only are more Australians surviving to retirement age, but more are having an extended period of retirement. This is contributing significantly to the growth of our older population. The greater survival of Australians into older age may not however have produced an older generation which is healthier than previous generations. While we lack definitive data in Australia, Table 3 shows that ABS sample surveys of self-reported health indicates that the proportion of older Australians aged over 65 years reporting some form of disability increased by 8 percentage points between 1981 and This might indicate that medical breakthroughs are rescuing older Australians from death, but they are then surviving with some disability or chronic ailment. The implications for health services, workforce participation, volunteering and the day-to-day lives of people are considerable. The ABS in Australia anticipates that life expectancy in Australia will continue to increase [21]. However, some commentators have questioned this as the onset of the global obesity epidemic and its impacts on health may be expected to slow these past substantial increases in longevity [22]. It has been suggested that the link between poor health and obesity will mean that recent substantial increases in life expectancy among older Australians will not continue. Figure 4 shows that one of the most striking changes in health risk behaviour in the Australian population since 1980 has been an increase in the proportion who are overweight or obese. Moreover, in the context of considering ageing, it is interesting to note in Figure 5 that baby boomers (those born between 1946 and 1964) have high levels of overweight and obesity and significantly higher than the current 65+ population when they 20 Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013, 18 27

4 30 Years of changing demographics in Australia Figure 4: Australia: Adults in normal, overweight and obese body mass index categories, based on self reported height and weight, /2012. Figure 6: Total fertility rate Australia, Percent Total Fertility Rate (Per 1000 Female Population) Postwar Year Source: [28]. Capital cities and urban areas only in Source: [Australian Bureau of Statistics, unpublished data, 26,27] Figure 5: Australia: Proportion of persons who were overweight or obese a by age and sex, Percent Age Group (years) were the same age [23]. If these patterns continue this will lead to greatly increased morbidity, chronic diseases and disability among older Australians [24]. Moreover, it has been shown that Generation X (those born between 1965 and 1981) has higher levels of obesity than baby boomers had at the same age [25]. Men Women a Based on body mass index for persons whose height and weight was measured. Source: Australian Bureau of Statistics, Australian Bureau of Statistics, unpublished data, 2012 [26,27]. Changing fertility trends have had a major impact on the growth and ageing of Australia s population. Figure 6 illustrates trends in Australia s total fertility rate (TFR) 1 over the last century and shows that Australian fertility began to decline in the 1870s and fell more or less continuously until 1946 when there was an upturn. The postwar baby boom saw total fertility levels exceed 3.5 for almost two decades. This was followed by a precipitous decline in fertility to below 2. Since the 1970s, fertility has been fluctuating around 1.8 and 1.9. Hence there has been only a small change in the TFR between in 1981 and in The high fertility of the two decades following World War II had a massive impact on Australia s postwar demography. The baby boomers are now poised to enter the older age groups, causing significant growth in Australia s older population over the next two decades. The demography of few countries has been as strongly affected by international migration as Australia. Figure 2 demonstrates that net migration on average has contributed around half of Australia s population growth over the last 30 years. However, its impact has gone far beyond a numerical one with one of the major shifts being an increase in diversity. Figure 7 demonstrates the diversity of the Australian permanent settler intake with the increasing Asia, Pacific, Middle Eastern and African groups. This has resulted in Australia becoming one of the most diverse nations in the OECD. Table 4 compares some cultural indicators at the 1981 and 2011 population censuses and shows the increase in the proportion of Australians who are migrants and the diversity in language and religion. 1 The TFR can be defined as: the average number of children that would be born alive to a woman during her lifetime if she were to pass through all her child-bearing years conforming to the agespecific fertility rates of a given year. Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013,

5 Graeme Hugo Figure 7: Australia: Settler arrivals by region of last residence, Number UK and Ireland Other Europe Africa Americas NZ and Pacific Middle East Asia Source: DIMIA (Department of Immigration and Multicultural and Indigenous Affairs (Australia) ), Australian Immigration: Consolidated Statistics [29];DIAC DIAC (Department of Immigration and Citizenship), Immigration Update, various issues [30]; DIAC, unpublished data. One dimension of the increased cultural diversity in Australia s population over the period has been within the nation s older population. In 1981, some 24.4% of the Australian aged were born overseas, 9.8% in Culturally and Linguistically Diverse (CALD) countries. However, by 2011 this proportion had increased to 35.9 and 21.7%, respectively. Table 5 shows that while the Australia-born population aged 65+ increased by 68.1%, the overseas-born almost trebled (191.5%), while CALD older people increased by 339.5% five times that of the Australia-born. The diversification of the Australian older population is one of the most significant dimensions of Australia s ageing population. Year Table 4: Cultural indicators, 1981 and 2011 Characteristic Overseas-born (%) Australia-born with at least one parent OS-born (%) NES-born (%) British/Australian ancestry (first response)* (%) Non-Christian religion (%) OS-born not able to speak English well or not at all (%) OS-born who speak language other than English at home (%) Asian ancestry (first response)* (%) na 10.6 *1986 census. Source: Australian Bureau of Statistics, unpublished data, 1981, 1986 and 2011 censuses. na, not applicable; NES, non-english speaking; OS, overseas. One important change in Australian immigration in recent decades has been the greatly increased importance of nonpermanent movements, especially those involving workers and students. In 1981 the Australian immigration program focused almost entirely on permanent settlement and eschewed temporary worker migration. At the end of 2011, it was estimated that there were 1.05 million persons temporarily in Australia [31] equivalent to 4.7% of the total population. These are primarily made up of overseas students ( in September 2011), Temporary Business (Long Stay 457) migrants ( ), and Working Holiday Makers ( ) as well as short-term visitors. Changing population composition The processes described earlier have not only reshaped the size of the Australian population over the last three decades, but produced some profound changes in its composition. Increased multicultural diversity has already been demonstrated, but perhaps the most discussed element of change has been ageing. As Figure 1 dramatically attests, there has been a major shift, which has meant the proportion of the national population aged less than 35 has decreased (from 58.6 in 1981 to 46.4 in 2011) while those older increased their share from 41.4 to 53.6%. Most focus has been on the aged 65 years or more whose numbers almost doubled from 1.43 million in 1981 to 3.01 million in 2011 and their proportion of the population increased from 9.8 to 14.0%. The 65+ population grew more than twice as fast as the total population compared with 47.6% change. All three demographic processes discussed mortality, fertility and migration have contributed to these patterns: Lowered mortality has an impact through increased life expectancy, especially at older ages. Low fertility has meant the young population is growing more slowly than in the past. While immigrants are selectively drawn from the young working ages, immigrants themselves age and contribute to the growth of the older population. The large baby boom cohort born during the high-fertility postwar years has had a large impact on Australia s demography throughout their lives, contributing to a younging of the national age structure when they were children and its ageing as they have moved up the age pyramid. Their impact is still considerable, with Australian census figures showing they make up 25.4% of the total population in 2011 and 36% of the workforce (compared with 33.6 and 52.5% in 1981). The passage of the baby boom into the 65+ years age group over the next two decades will produce an unprecedented ageing of the national population. The demography of this ageing will have four major dimensions using the 2008 median projections [21]: The population aged 65+ will increase by 86% between 2011 and The percentage aged 65+ will increase from 13.8 to 19.9%. The characteristics of Australia s older population will change as baby boomers replace the pre-war generation in their age. The spatial distribution of the older population will change as baby boomers replace the pre-war generation. This change presents considerable challenges, with the ratio of workers to dependants set to decline and the demand for 22 Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013, 18 27

6 30 Years of changing demographics in Australia Table 5: Australia: Birthplace by Age 65+, 1981, 2006 and 2011 Birthplace Aged 65+ years Percent change Total population Number Percent 1981 Australia Overseas-born MES NES Total (minus NS, Inad Des, At Sea, Nec) Australia Overseas-born MES NES Total (minus NS, Inad Des, At Sea, Nec) Source: Australian Bureau of Statistics (ABS) 1981 census, one percent sample; ABS, unpublished data, 2011 censuses. At Sea, born at sea; Inad Des, inadequately described; MES, mainly English speaking; minus NS, minus not stated; Nec, not elsewhere classified; NES, non-english speaking. health services, age support pensions and eventually aged care services set to increase significantly. Another major transformation that has occurred over the last three decades has been in the way in which Australians group themselves into households. The full degree of change in the diversity in Australian households cannot be fully captured by census data, but we note the following: 1. There has been a consistent decline in the average size of Australian households from 3.0 to 2.6 in However, since then there has been relative stability with a size of 2.6 recorded in This reduction in size has been a function of several factors: Younger people have left home at an early age to set up new households, especially during times of relatively full employment; Older people have increasingly remained in independent living situations as the century has progressed, with smaller proportions going to live with their children or enter aged care institutions; Increasing levels of divorce and separation have led to splitting of households; and Other fluctuations in the economy, the cost of housing and lending interest rates may also have contributed. This decline in household size has meant that the rate of increase in the number of households has outpaced that in the population with significant implications for the provision of services. The recent stabilisation in household size is due to a reduction in the rate of household formation in most age groups [32]. 2 Another important shift has come in household composition with an increasing diversification of living arrangements being one of the key changes of the period. Some of these shifts such as the growth of same-sex partnerships, blended families, and multigenerational families cannot be captured in the census data, but Figure 8 indicates some important shifts. Non-family households (group and single-person households) have been among the most rapidly growing Figure 8: Australia: Change in the number of families/ households, Change (%) Couple with Children Couple Without Children One-Parent Family/Household Type Source: Australian Bureau of Statistics censuses, unpublished data. Single- Group Person Households Households while single-parent families have more than doubled. In 1981, 47.1% of households had only one or two persons, but by 2011 this had increased to Couple families with dependent children have been one of the slowest household types although much Australian planning is aimed dominantly at this stereotypical average household [1]. One of the most important elements in Australia s demography is the Aboriginal and Torres Strait islander population. Changes in this group over the period are shown in Table 6. There are substantial difficulties in the counting of the indigenous population. This is partly associated with the marginal circumstances in which many live, leading to them being missed in censuses. This problem has been overcome to a degree in recent censuses through the ABS employing special procedures, which undoubtedly have led to successively greater proportions of the population being counted. A greater problem relates to variations between censuses in the extent to which people do or do not identify themselves as Aboriginal in the census. Increased readiness to identify Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013,

7 Graeme Hugo Table 6: Indigenous status population, 1981 and 2011 Characteristic Number % of total Growth rate Total fertility rate Life expectancy Males ( ) Females ( ) Living in capitals (%) Age less than 15 (%) Aged 65+ (%) Figure 9: Australia: Weighted population centre, 1981 and Source: Australian Bureau of Statistics, unpublished data, 1981 and 2011 Censuses. oneself as Aboriginal, especially following The Apology undoubtedly is a major factor in the recent rapid growth. It is apparent from Table 6 that the Aboriginal population differs from their non-aboriginal counterparts with higher mortality and fertility rates resulting in a more rapid natural increase rate and a very young age structure. It is notable that, despite some improvement, mortality rates remain much higher than the Australian average. Aboriginal people are also much more represented in regional areas than the non-aboriginal population. Population distribution Australia has a very distinctive population distribution and the broad outlines of that distribution have changed little over the last century [12]. Figure 9 depicts the geographic centre of gravity of the Australian population in 1981 and 2011 and only a small movement northward is apparent. This reflects the fact that Queensland has been the fastest growing state over this period. Nevertheless, it is apparent from Table 7 that there have been only minor changes in the structure of Australia s population distribution. Australia is a strongly urbanised country with more than two-thirds of the population living in cities. There has been a small increase in the proportion living in urban areas over the last three decades. In fact there has been a similar rate of growth between capital city and regional populations over this period. However, this has masked some important shifts in the detail of the Australian population distribution. First, the balance between states and territories has changed. In the early postwar years the southeastern part of the country was the most rapidly growing due to the fast pace of industrial development. However, since 1981 Queensland and Western Australia have grown fastest, so that the proportion of the national population living in the southeastern states declined from 74.7% in 1981 to 68.5% in The shift of population from non-metropolitan to metropolitan areas has been an important feature of Australia s postwar demography. Quantifying the change has been made difficult by definitional problems but it is apparent from Table 7 that there has been a slight increase in urbanisation over the period. Figure 10 shows that in fact the Source: Australian censuses, unpublished data, 1981 and proportion of the national population living in the capital cities declined slightly between 1971 and 1996, but thereafter began to increase. The proportion of the population living in capital cities has especially increased since 2006 concurrent with rapid population growth and high levels of immigration. Within non-metropolitan areas there have been contrasting patterns of population growth between different regions. Areas of population growth are strongly concentrated in: the areas surrounding metropolitan areas; along the well-watered east coast and southwest coast; some resort and retirement areas; some regional centres; along the Hume Highway linking Sydney and Melbourne; and some relatively remote areas, especially those with growing mining activities, tourism and significant indigenous populations. On the other hand, there is also a concentration of the areas experiencing population decline: the dry farming areas of the wheat-sheep belt, such as in western Victoria, extending through central-western New South Wales and Queensland; the southeast, Eyre Peninsula and mid north of South Australia; and the wheat-sheep belt of Western Australia; many pastoral areas in central Australia; certain mining areas such as Broken Hill; and 24 Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013, 18 27

8 30 Years of changing demographics in Australia Table 7: Distribution of Australia-born and overseas-born population between major urban, other urban and rural areas, Australia-born Number Percent Number Percent Number Percent Number Percent Major urban Other urban Rural Total Overseas-born Major urban Other urban Rural Total Percent Change Australia-Born Overseas-Born Major urban Other urban Rural Total Birthplace not stated not included. Source: Australian Bureau of Statistics censuses, , unpublished data. Figure 10: Australia: Percentage of population living in capital cities, cities, encouraged by both planning policy and changing preferences. Percent of Population in Capital Cities Source: [33]. declining industrial cities such as Whyalla in South Australia. Finally, within capital cities there have been some interesting changes in population distribution. For most of the postwar period increasing levels of car ownership in postwar Australia fostered the lateral extension of low-density suburbs in Australia s large metropolitan areas. For the early postwar decades the bulk of population growth in major cities occurred in the outer suburbs. However, population growth is increasingly occurring in older built-up areas of the major Year Public discussion on population Population issues have waxed and waned in Australian public discussion since Federation [34] and this has certainly been the case during the period. In 1981, the National Population Inquiry [14,15] had been recently released giving unprecedented detailed analysis of Australian population trends and issues. The 1980s saw a revival of concern about population and environment an issue that had been largely quiet since the 1920s. A questioning of the pressures that population growth was putting on the environment intensified in the 1980s [35,36] and there were several major investigations into population and environment. The first was the inquiry into Population Issues and Australia s Future: Environment, Economy and Society undertaken by the Population Issues Committee of the National Population Council [37,38]. The Council was asked by the Prime Minister to examine all pertinent matters including the impact of population increase on the economy, environment, human service delivery, infrastructure, social equity and international obligations [37]. The report produced by the Committee argued that Australia was at a crossroads with respect to its population and called for the development of a population policy that seeks to influence and respond to population change, to advance economic progress, ecological integrity, social justice and responsible international involvement. The report advocated strongly for a more holistic approach to considerations of population, which balanced economic, Australasian Journal on Ageing, Vol 32 Supplement 2 October 2013,

9 Graeme Hugo environment and social considerations. It argued that environmental considerations made it necessary to adopt a precautionary approach to population and to move towards a more sustainable future. Two other key documents from the 1990s were reports from the Australian Academy of Science [39] and the Commonwealth House of Representatives Standing Committee on Long Term Strategies Inquiry Into Australia s Carrying Capacity [40]. All these argued that Australia should move towards the development of a comprehensive population policy which was both proactive and responsive. Unfortunately they had little impact. The last decade has seen a strengthening of the debate [1] [41 48]. This reached a peak in the period leading up to the 2010 Federal Election and the incoming government established a Ministry and Department of Population for the first time. However, there have been no moves towards a comprehensive analysis of population and its implications for Australia s economy, society, environment and security, and related policy. The recent population debate in Australia has had a number of distinctive features: Population has been seen as synonymous with immigration and the other dimensions of population change are largely ignored. Environmental impacts are a much more important element in the immigration/population debate in Australia than elsewhere in North America or Europe [36, 46]. The debate has been strongly polarised, between continued rapid population growth on the one hand and little or no growth on the other. The sides in the debate are not drawn along traditional, party political, lines. There are both anti-growth and pro-growth elements on both sides of politics. There is strong continuity with the past in that issues of the size of the future population and optimum population dominate public discussion. Another element of continuity is the revival of interest in population distribution issues, regional development and decentralisation. The debate has generally been populist in nature and too often characterised by misinformation, self-interest and bigotry. While the debate has been overwhelmingly on numbers, population growth and the role of immigration there also have been some discussions regarding fertility. This debate culminated in the federal government introducing a baby bonus and a number of family friendly initiatives in an effort to forestall further fertility decline [49]. Conclusion Australia s population has experienced profound change since the Australian Journal on Ageing was launched in February Some of these changes were anticipated in contemporary demographic analyses [9,14], but others have surprised demographers. The former includes the growth of the older population outpacing that of the total population as well as increasing ethnic and household diversity. However, changes in population growth, composition and distribution are both caused by and influence economic, social, political and environmental processes and are difficult to anticipate. Some elements such as changes in the numbers and characteristics of the older population are readily projected with a high degree of confidence. Others, such as population growth, distribution and migration levels are more difficult. It is important, however that public discussions and policy makers be informed by detailed understanding of evolving processes and trends in population. References 1 Hugo GJ. Demographic change and liveability panel report, Report commissioned by the Hon. Tony Burke MP, Minister for Sustainability, Environment, Water, Population and Communities. December, Organisation for Economic Co-operation and Development (OECD). International migration outlook 2013, OECD, United Nations. World Population Prospects: The 2012 Revision. New York: United Nations, Cotis J. 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