Year	% of total population
1960	79.9
1961	79.249
1962	78.582
1963	77.9
1964	77.197
1965	76.481
1966	75.748
1967	75
1968	74.185
1969	73.355
1970	72.508
1971	71.644
1972	70.762
1973	69.867
1974	68.955
1975	68.029
1976	67.425
1977	67.10300000000001
1978	66.779
1979	66.45400000000001
1980	66.126
1981	65.798
1982	65.468
1983	65.136
1984	64.80199999999999
1985	64.468
1986	64.132
1987	63.794
1988	63.455
1989	63.256
1990	63.175
1991	63.094
1992	63.013
1993	62.932
1994	62.851
1995	62.769
1996	62.688
1997	62.606
1998	62.525
1999	62.443
2000	62.361
2001	62.28
2002	62.198
2003	62.116
2004	62.034
2005	61.931
2006	61.807
2007	61.661
2008	61.494
2009	61.306
2010	61.096
2011	60.865
2012	60.612
2013	60.337
2014	60.041
2015	59.723
2016	59.382
2017	59.02
2018	58.636
2019	58.23
2020	57.802
2021	57.352
2022	56.88
2023	56.386