Year	% of total population
1960	35.28
1961	35.18600000000001
1962	35.137
1963	35.087
1964	35.038
1965	34.989000000000004
1966	34.93899999999999
1967	34.89
1968	34.840999999999994
1969	34.792
1970	34.742000000000004
1971	34.699
1972	34.68899999999999
1973	34.679
1974	34.669
1975	34.659000000000006
1976	34.649
1977	34.638999999999996
1978	34.629000000000005
1979	34.619
1980	34.608999999999995
1981	34.635999999999996
1982	34.900000000000006
1983	35.164
1984	35.43000000000001
1985	35.69499999999999
1986	35.962999999999994
1987	36.231
1988	36.5
1989	36.769
1990	37.04
1991	37.311
1992	37.583
1993	37.856
1994	38.13
1995	38.404
1996	38.68
1997	38.955
1998	39.232
1999	39.509
2000	39.787
2001	40.066
2002	40.345
2003	40.625
2004	40.906
2005	41.187
2006	41.468
2007	41.751
2008	42.034
2009	42.317
2010	42.601
2011	42.885
2012	42.853
2013	42.664
2014	42.474
2015	42.285
2016	42.095
2017	41.906
2018	41.703
2019	41.485
2020	41.252
2021	41.005
2022	40.744
2023	40.47