Year	% of total population
1960	27.510000000000005
1961	26.705
1962	25.729
1963	24.777
1964	23.846999999999994
1965	22.944000000000003
1966	22.086
1967	21.272999999999996
1968	20.480999999999995
1969	19.712999999999994
1970	18.965999999999994
1971	18.436999999999998
1972	18.114000000000004
1973	17.796999999999997
1974	17.483000000000004
1975	17.269999999999996
1976	17.197999999999993
1977	17.126999999999995
1978	17.055999999999997
1979	16.983999999999995
1980	16.912999999999997
1981	16.900000000000006
1982	16.900000000000006
1983	16.900000000000006
1984	16.900000000000006
1985	16.900000000000006
1986	16.900000000000006
1987	16.900000000000006
1988	16.900000000000006
1989	16.900000000000006
1990	16.900000000000006
1991	16.796000000000006
1992	16.638999999999996
1993	16.483999999999995
1994	16.328999999999994
1995	16.176000000000002
1996	16.086
1997	16.058000000000007
1998	16.03
1999	16.001999999999995
2000	15.974000000000004
2001	15.929000000000002
2002	15.867000000000004
2003	15.804000000000002
2004	15.742000000000004
2005	15.680999999999997
2006	15.569999999999993
2007	15.412000000000006
2008	15.254000000000005
2009	15.097999999999999
2010	14.944000000000003
2011	14.703000000000003
2012	14.379999999999995
2013	14.063999999999993
2014	13.753
2015	13.447000000000003
2016	13.147999999999996
2017	12.854
2018	12.569000000000003
2019	12.292000000000002
2020	12.022999999999996
2021	11.762
2022	11.507999999999996
2023	11.262