Year	% of total population
1960	30.08159893867409
1961	29.68045476034306
1962	29.26021628802535
1963	28.843634586084185
1964	28.43061234603899
1965	28.021282360367252
1966	27.617384295136596
1967	27.23780156586488
1968	26.861450309928077
1969	26.488776098391572
1970	26.19834209980082
1971	26.143873653834955
1972	26.14613945305357
1973	26.148171659591874
1974	26.149871484098696
1975	26.151695132976418
1976	26.152562049679574
1977	26.13941899110797
1978	26.12755251287031
1979	26.114873027843572
1980	26.06887329998093
1981	25.926548464263316
1982	25.77323808716811
1983	25.62027355347618
1984	25.46919924939637
1985	25.318307594408726
1986	25.16842566105773
1987	25.03145862102666
1988	24.894635333206608
1989	24.75909854285805
1990	24.566730614446957
1991	24.202227593924913
1992	23.819426011325277
1993	23.441219199237377
1994	23.066807159322217
1995	22.69697386465799
1996	22.328315560403464
1997	21.954794605156916
1998	21.584506808720917
1999	21.218330989379727
2000	20.89757587795204
2001	20.7053582337638
2002	20.53985875195171
2003	20.375225486499538
2004	20.210708091422482
2005	20.048991309527448
2006	19.88590346738251
2007	19.71467014090917
2008	19.54442034016667
2009	19.375247196692065
2010	19.208013935071385
2011	19.037358004152672
2012	18.87569880651223
2013	18.70962518535705
2014	18.540125746550363
2015	18.366907975608076
2016	18.191231856833973
2017	18.010359909818746
2018	17.826951369528704
2019	17.63835246881103
2020	17.446383553902887
2021	17.250019380549514
2022	17.052434564629966
2023	16.852689379400548