Year	% of total population
1960	74.463
1961	73.856
1962	73.76599999999999
1963	73.67699999999999
1964	73.587
1965	73.498
1966	73.408
1967	73.318
1968	73.227
1969	73.137
1970	73.04599999999999
1971	72.955
1972	72.864
1973	72.773
1974	72.681
1975	72.59
1976	72.498
1977	72.406
1978	72.313
1979	72.221
1980	72.128
1981	72.035
1982	71.94200000000001
1983	71.849
1984	70.97200000000001
1985	70.06
1986	69.129
1987	68.18299999999999
1988	67.22
1989	66.245
1990	65.255
1991	64.25200000000001
1992	63.234
1993	62.208
1994	61.169
1995	59.506
1996	57.813
1997	56.107
1998	54.384
1999	52.65
2000	50.908
2001	49.168
2002	47.427
2003	45.693
2004	43.967
2005	42.26
2006	40.569
2007	38.9
2008	37.255
2009	35.641999999999996
2010	34.06
2011	32.512
2012	31
2013	30.456000000000003
2014	29.917
2015	29.384
2016	28.861999999999995
2017	28.354
2018	27.857
2019	27.373000000000005
2020	26.900000000000006
2021	26.438999999999993
2022	25.989999999999995
2023	25.552000000000007