Year	% of total population
1960	43.177
1961	42.886
1962	42.595
1963	42.304
1964	42.013
1965	41.724
1966	41.435
1967	41.147
1968	40.858
1969	40.571
1970	40.285
1971	39.999
1972	39.713
1973	39.429
1974	39.145
1975	38.862
1976	38.579
1977	38.298
1978	38.017
1979	37.737
1980	37.458
1981	36.591
1982	35.578
1983	34.57899999999999
1984	33.590999999999994
1985	32.620000000000005
1986	31.811999999999998
1987	31.459000000000003
1988	31.108000000000004
1989	30.760000000000005
1990	30.406999999999996
1991	30.034000000000006
1992	29.662999999999997
1993	29.296000000000006
1994	28.930999999999997
1995	28.569000000000003
1996	28.694000000000003
1997	28.933999999999997
1998	29.174999999999997
1999	29.418000000000006
2000	29.662000000000006
2001	29.906999999999996
2002	30.153000000000006
2003	30.400000000000006
2004	29.617000000000004
2005	28.848
2006	28.090000000000003
2007	27.345
2008	26.611000000000004
2009	25.891000000000005
2010	25.183000000000007
2011	24.489000000000004
2012	23.805999999999997
2013	23.138000000000005
2014	22.483000000000004
2015	21.840999999999994
2016	21.224999999999994
2017	20.635000000000005
2018	20.069999999999993
2019	19.53
2020	19.012
2021	18.516999999999996
2022	18.043999999999997
2023	17.592