Year	% of total population
1960	25.631403566014
1961	25.1297097667236
1962	24.474982878871
1963	23.9222650529399
1964	23.5381631893534
1965	23.1742097327247
1966	22.7472304853637
1967	22.3069453360778
1968	21.9090319304355
1969	21.5826532114293
1970	21.331513971782
1971	21.1601246018331
1972	21.1069470141202
1973	21.2527378613044
1974	21.6388931360666
1975	22.12448798537
1976	22.5716540009315
1977	22.9533415105073
1978	23.2289657632504
1979	23.3814023908421
1980	23.4580945263175
1981	23.4990583036845
1982	23.5183970219427
1983	23.5223725316474
1984	23.4894326439825
1985	23.3979842706387
1986	23.2356192757613
1987	22.9739192524385
1988	22.5730705447668
1989	22.0304041085757
1990	21.4242380190449
1991	20.8584741979596
1992	20.3173362546274
1993	19.7750413039974
1994	19.2172983981431
1995	18.673779556469
1996	18.1854066343158
1997	17.726219591714
1998	17.2963120744615
1999	16.879980353487
2000	16.4653321882105
2001	16.0653730163292
2002	15.695759105387
2003	15.3396735716473
2004	15.0075250957533
2005	14.7099793552853
2006	14.4461448361761
2007	14.2767548196048
2008	14.2087701182329
2009	14.2417413599373
2010	14.4022231206883
2011	14.5912516397918
2012	14.7541526360151
2013	14.9214957079724
2014	15.0978330078263
2015	15.2715785342696
2016	15.4296845037808
2017	15.57872457402
2018	15.7260607979824
2019	15.8637464575584
2020	15.9618120049623
2021	16.0029438430681
2022	15.9524750652421
2023	15.7917190512511