Year	% of total population
1960	67.59899999999999
1961	66.47800000000001
1962	65.337
1963	64.178
1964	63
1965	61.873
1966	60.731
1967	59.578
1968	58.412
1969	57.24
1970	55.99
1971	54.651
1972	53.303
1973	51.954
1974	50.6
1975	49.386
1976	48.171
1977	46.961
1978	45.753
1979	44.598
1980	43.502
1981	42.416
1982	41.336
1983	40.264
1984	39.2
1985	38.167
1986	37.143
1987	36.13
1988	35.128
1989	34.415000000000006
1990	34.019000000000005
1991	33.626000000000005
1992	33.233999999999995
1993	32.845
1994	32.459
1995	32.074
1996	31.691999999999993
1997	31.313000000000002
1998	30.936000000000007
1999	30.518
2000	30.027
2001	29.542
2002	29.061000000000007
2003	28.584999999999994
2004	28.113
2005	27.646
2006	27.183999999999997
2007	26.727000000000004
2008	26.274
2009	25.828000000000003
2010	25.328000000000003
2011	24.811999999999998
2012	24.302999999999997
2013	23.801000000000002
2014	23.307000000000002
2015	22.819000000000003
2016	22.339
2017	21.866
2018	21.405
2019	20.956000000000003
2020	20.516999999999996
2021	20.090000000000003
2022	19.674000000000007
2023	19.269000000000005