Year	% of total population
1960	31.078715813398436
1961	31.181558122096007
1962	31.03480595124818
1963	30.87196153156668
1964	30.823716601550498
1965	30.8302432816698
1966	30.491740383661735
1967	29.953760598460047
1968	29.497160473700742
1969	28.98672347886945
1970	28.45859258919078
1971	27.89800996569959
1972	27.265613297803558
1973	26.577834527844036
1974	25.895835771118016
1975	25.215260599663257
1976	24.53637361507957
1977	23.915588354641688
1978	23.35950982545031
1979	22.876286248620904
1980	22.50149210949933
1981	22.237221674768723
1982	22.04769102640097
1983	21.873023770217983
1984	21.694517122053643
1985	21.50833644754841
1986	21.344315598533264
1987	21.2781901427994
1988	21.305365804930265
1989	21.373708271278016
1990	21.471633042028635
1991	21.5849947681543
1992	21.68240813500202
1993	21.738562361990294
1994	21.730331106341048
1995	21.662688841547386
1996	21.57043000853737
1997	21.484671057157417
1998	21.408144841594396
1999	21.32383422353203
2000	21.20474752242785
2001	21.048761454726794
2002	20.889154286833364
2003	20.728422720406336
2004	20.539391565151508
2005	20.322941262856556
2006	20.119690734137894
2007	19.955233338194308
2008	19.817569881933462
2009	19.68229248649776
2010	19.53846078282409
2011	19.41301617118206
2012	19.311288335352316
2013	19.210044092488808
2014	19.104184525678
2015	18.989859352984364
2016	18.877054665732125
2017	18.76411442893941
2018	18.62267213808613
2019	18.452414026765034
2020	18.238804224565932
2021	17.983329283156397
2022	17.70969444373943
2023	17.431635886425575