Year	% of total population
1960	25.7704557431891
1961	25.3440759591902
1962	25.297766191739
1963	25.4364800842253
1964	25.4379577675933
1965	25.4250402559652
1966	25.472892919884
1967	25.5439773226334
1968	25.5998750463695
1969	25.6445540202206
1970	25.7279370432827
1971	25.8339798293251
1972	25.8738059510303
1973	25.8223714052436
1974	25.6925319941681
1975	25.4584778178958
1976	25.2063988068817
1977	25.047200606991
1978	24.8902931367386
1979	24.6627996365924
1980	24.3544233312452
1981	24.0344911343211
1982	23.909503516613
1983	23.8953387627794
1984	23.7720578018619
1985	23.5017175539242
1986	23.0740896653336
1987	22.5576542161856
1988	22.0303571428571
1989	21.3851015801354
1990	20.6373320642823
1991	19.9610930986568
1992	19.7123770643904
1993	19.8336898001328
1994	19.9200923702876
1995	19.8985827116356
1996	19.8297655639016
1997	19.7308034175631
1998	19.5798881872953
1999	19.35151919987
2000	19.0689039886091
2001	18.6179902959903
2002	18.2844850766335
2003	18.2802727818805
2004	18.3103496308678
2005	18.3447376995764
2006	18.2698482441613
2007	18.1290838778504
2008	18.0781946477622
2009	18.067070103996
2010	18.0954513466829
2011	18.1269025124994
2012	18.0926320371896
2013	17.961494554318
2014	17.8478984346111
2015	17.8000891772629
2016	17.7460463688009
2017	17.6952334212625
2018	17.618230825778
2019	17.463401202368
2020	17.2309950012994
2021	17.1031084038629
2022	17.0403381420564
2023	16.9218532511434