Year	% of total population
1960	17.680000000000007
1961	17.662999999999997
1962	17.644999999999996
1963	17.628
1964	17.611000000000004
1965	17.5
1966	17.239000000000004
1967	16.980999999999995
1968	16.724999999999994
1969	16.474000000000004
1970	16.224999999999994
1971	15.979
1972	15.735
1973	15.495999999999995
1974	15.259
1975	15.025000000000006
1976	14.793999999999997
1977	14.566000000000003
1978	14.340999999999994
1979	14.117999999999995
1980	13.899000000000001
1981	13.683000000000007
1982	13.468999999999994
1983	13.257999999999996
1984	13.049999999999997
1985	12.844999999999999
1986	12.643
1987	12.442999999999998
1988	12.245999999999995
1989	12.051000000000002
1990	11.86
1991	11.671000000000006
1992	11.602000000000004
1993	11.605000000000004
1994	11.608000000000004
1995	11.611999999999995
1996	11.614999999999995
1997	11.617999999999995
1998	11.620999999999995
1999	11.623999999999995
2000	11.628
2001	11.631
2002	11.626999999999995
2003	11.617000000000004
2004	11.600999999999999
2005	11.578000000000003
2006	11.548000000000002
2007	11.512
2008	11.469999999999999
2009	11.421000000000006
2010	11.366
2011	11.305000000000007
2012	11.238
2013	11.165000000000006
2014	11.084999999999994
2015	11.001000000000005
2016	10.909999999999997
2017	10.813999999999993
2018	10.712999999999994
2019	10.605999999999995
2020	10.494
2021	10.378
2022	10.257000000000005
2023	10.131