Year	% of total population
1960	64.416
1961	63.041
1962	61.642
1963	60.224
1964	58.786
1965	57.337
1966	55.874
1967	54.4
1968	51.771
1969	49.139
1970	46.508
1971	43.897
1972	41.315
1973	38.788
1974	38.907
1975	39.368
1976	39.832
1977	40.296
1978	40.763
1979	41.231
1980	41.702
1981	41.174
1982	40.386
1983	39.604
1984	38.825
1985	38.055
1986	37.289
1987	36.53
1988	35.775999999999996
1989	35.286
1990	34.946
1991	34.608000000000004
1992	34.272000000000006
1993	33.937
1994	33.604
1995	33.272999999999996
1996	32.94199999999999
1997	32.614999999999995
1998	32.288
1999	31.947000000000003
2000	31.42
2001	30.899
2002	30.382000000000005
2003	29.870000000000005
2004	29.363
2005	28.861999999999995
2006	28.364999999999995
2007	27.873999999999995
2008	27.387
2009	26.906999999999996
2010	26.432000000000002
2011	25.962000000000003
2012	25.501999999999995
2013	25.054000000000002
2014	24.616
2015	24.188999999999993
2016	23.772000000000006
2017	23.366
2018	22.968999999999994
2019	22.583
2020	22.206000000000003
2021	21.837999999999994
2022	21.480000000000004
2023	21.132000000000005