Year	% of total population
1960	47.133
1961	46.337
1962	45.541
1963	44.747
1964	43.955
1965	43.168
1966	42.383
1967	41.602
1968	40.825
1969	40.054
1970	39.287
1971	38.567
1972	37.878
1973	37.195
1974	36.516
1975	35.843
1976	35.17400000000001
1977	34.513000000000005
1978	33.857
1979	33.31399999999999
1980	32.905
1981	32.56
1982	32.278000000000006
1983	31.997
1984	31.717
1985	31.439999999999998
1986	31.218000000000004
1987	31.052999999999997
1988	30.888000000000005
1989	30.799999999999997
1990	30.75
1991	30.799000000000007
1992	31.147999999999996
1993	31.200999999999993
1994	31.099000000000004
1995	31.25
1996	31.349999999999994
1997	31.400000000000006
1998	31.549000000000007
1999	31.78
2000	31.933000000000007
2001	32.05
2002	32.150000000000006
2003	32.2
2004	32.099999999999994
2005	32
2006	32.033
2007	32.099999999999994
2008	32.166
2009	32.18600000000001
2010	32.159000000000006
2011	32.131
2012	32.102999999999994
2013	32.075
2014	32.048
2015	32.019999999999996
2016	31.979
2017	31.924999999999997
2018	31.858000000000004
2019	31.778000000000006
2020	31.685000000000002
2021	31.578999999999994
2022	31.459999999999994
2023	31.328999999999994