Year	% of total population
1960	28.6964654008943
1961	29.2802295819437
1962	29.6823180123733
1963	29.9140228163429
1964	30.0181113464476
1965	29.9945095632274
1966	30.1347153395996
1967	30.4923825136612
1968	30.7607236645433
1969	30.8622363641887
1970	30.6337676454373
1971	30.169623444326
1972	29.6819726679477
1973	29.1737223520544
1974	28.6334905791762
1975	28.0734339036521
1976	27.5312464224227
1977	27.0142727288237
1978	26.5270948161733
1979	26.1067964716794
1980	25.8064202690968
1981	25.6219107573236
1982	25.5023361744216
1983	25.3988420259972
1984	25.3058307160109
1985	25.2327225982591
1986	25.1603667906856
1987	25.0912516168061
1988	25.0070892693828
1989	24.932882427385
1990	24.955915510238
1991	25.0357306896678
1992	25.0791346790213
1993	25.0795463920019
1994	25.0260258631953
1995	24.9045652068731
1996	24.7261236073049
1997	24.4945185722857
1998	24.1921983531799
1999	23.7995876892038
2000	23.320806288703
2001	22.7701342134113
2002	22.1641526891239
2003	21.5440096997766
2004	20.9263449865808
2005	20.2870658665855
2006	19.6696253750285
2007	19.1832115460746
2008	18.8812867804032
2009	18.7571097163714
2010	18.71523661063
2011	18.6946019820696
2012	18.7109986552257
2013	18.7752846159789
2014	19.0039173501385
2015	19.3810240532551
2016	19.7683175510659
2017	20.1268856544447
2018	20.4501865560364
2019	20.7125497290304
2020	20.9070472172478
2021	21.0943113055418
2022	21.2641566954044
2023	21.3242050896365