Year	% of total population
1960	43.433
1961	42.697
1962	41.692
1963	40.694
1964	39.702
1965	38.722
1966	37.749
1967	36.786
1968	35.831999999999994
1969	34.891999999999996
1970	33.962
1971	33.152
1972	32.459
1973	31.775999999999996
1974	31.099000000000004
1975	30.430000000000007
1976	29.769000000000005
1977	29.117000000000004
1978	28.473
1979	27.837999999999994
1980	27.211
1981	26.721000000000004
1982	26.485
1983	26.251000000000005
1984	26.018
1985	25.787000000000006
1986	25.555999999999997
1987	25.326999999999998
1988	25.099999999999994
1989	24.873999999999995
1990	24.649
1991	24.471999999999994
1992	24.39
1993	24.308000000000007
1994	24.226
1995	24.144000000000005
1996	24.061999999999998
1997	23.980999999999995
1998	23.900000000000006
1999	23.819000000000003
2000	23.738
2001	23.656999999999996
2002	23.467
2003	23.221999999999994
2004	22.977999999999994
2005	22.736999999999995
2006	22.498000000000005
2007	22.260000000000005
2008	22.024
2009	21.790000000000006
2010	21.558000000000007
2011	21.326999999999998
2012	21.098
2013	20.867000000000004
2014	20.634
2015	20.397999999999996
2016	20.159999999999997
2017	19.92
2018	19.679000000000002
2019	19.435000000000002
2020	19.189999999999998
2021	18.944000000000003
2022	18.695999999999998
2023	18.447999999999993