Year	% of total population
1960	18.471000000000004
1961	18.058999999999997
1962	17.772000000000006
1963	17.489000000000004
1964	17.208
1965	16.932000000000002
1966	16.659999999999997
1967	16.492999999999995
1968	16.328000000000003
1969	16.164
1970	16.001000000000005
1971	15.840000000000003
1972	15.680000000000007
1973	15.522000000000006
1974	15.364000000000004
1975	15.207999999999998
1976	15.052999999999997
1977	14.900000000000006
1978	14.748000000000005
1979	14.596999999999994
1980	14.447999999999993
1981	14.299999999999997
1982	14.329999999999998
1983	14.358999999999995
1984	14.388999999999996
1985	14.418000000000006
1986	14.447999999999993
1987	14.477999999999994
1988	14.507000000000005
1989	14.537000000000006
1990	14.566999999999993
1991	14.596999999999994
1992	14.715000000000003
1993	14.843000000000004
1994	14.971999999999994
1995	15.102000000000004
1996	15.233000000000004
1997	15.364000000000004
1998	15.497
1999	15.629999999999995
2000	15.765
2001	15.900000000000006
2002	15.778000000000006
2003	15.656999999999996
2004	15.537000000000006
2005	15.418000000000006
2006	15.299999999999997
2007	15.177999999999997
2008	15.057000000000002
2009	14.936999999999998
2010	14.817999999999998
2011	14.700000000000003
2012	14.597999999999999
2013	14.498000000000005
2014	14.397999999999996
2015	14.299000000000007
2016	14.200000000000003
2017	14.096000000000004
2018	13.988
2019	13.876000000000005
2020	13.759
2021	13.638000000000005
2022	13.512
2023	13.382999999999996