Year	% of total population
1960	32.7589740586754
1961	32.4482239962976
1962	32.1454108629122
1963	31.8962837360464
1964	31.7150749142044
1965	31.6399103077325
1966	31.602172437203
1967	31.5728692476064
1968	31.6206268851065
1969	31.6886123571119
1970	31.5705899962255
1971	31.2828892348468
1972	31.0095664563403
1973	30.7637150440919
1974	30.5369628505312
1975	30.3106385073598
1976	30.0369021666322
1977	29.6641836021311
1978	29.1691985082985
1979	28.6336046675763
1980	28.104241185488
1981	27.5330750005732
1982	26.9277360776189
1983	26.3205614694919
1984	25.7815442561205
1985	25.3571036752606
1986	25.0135837082437
1987	24.7092616698762
1988	24.4678925457043
1989	24.3556538218572
1990	24.3391815328882
1991	24.3481697482402
1992	24.3427416287183
1993	24.2815327301756
1994	24.1168339715846
1995	23.9036639653008
1996	23.7516425755585
1997	23.695654616759
1998	23.7456814889112
1999	23.7912993462896
2000	23.7584730450399
2001	23.680397880852
2002	23.6002819729562
2003	23.4841691020542
2004	23.2420267355721
2005	22.8901566528271
2006	22.5322376999979
2007	22.2573741509258
2008	22.0959895892505
2009	21.9638856482103
2010	21.797149349308
2011	21.6087464219653
2012	21.3942531229658
2013	21.2544921310257
2014	21.192831866624
2015	20.9877807708459
2016	20.820202020202
2017	20.7553179840933
2018	20.685899322932
2019	20.7107060621892
2020	20.6820566631689
2021	20.6680091135124
2022	20.7197280064796
2023	20.7154187668366