Year	% of total population
1960	68.75
1961	67.62700000000001
1962	66.482
1963	64.989
1964	63.128
1965	61.231
1966	59.298
1967	57.335
1968	55.346
1969	53.345
1970	51.331
1971	49.312
1972	47.293
1973	45.288
1974	43.296
1975	41.651
1976	40.103
1977	38.579
1978	37.075
1979	35.595
1980	34.14
1981	32.718999999999994
1982	31.326999999999998
1983	29.967
1984	28.64
1985	27.352999999999994
1986	26.099999999999994
1987	25.411
1988	24.733000000000004
1989	24.069999999999993
1990	23.417
1991	22.777
1992	22.149
1993	21.813999999999993
1994	21.570999999999998
1995	21.33
1996	21.090000000000003
1997	20.852999999999994
1998	20.617000000000004
1999	20.384
2000	20.152
2001	19.923000000000002
2002	19.695999999999998
2003	19.47
2004	19.245999999999995
2005	19.021
2006	18.796000000000006
2007	18.572999999999993
2008	18.351
2009	18.132999999999996
2010	17.915999999999997
2011	17.697999999999993
2012	17.480000000000004
2013	17.260000000000005
2014	17.040000000000006
2015	16.819999999999993
2016	16.599000000000004
2017	16.378
2018	16.156000000000006
2019	15.935000000000002
2020	15.712999999999994
2021	15.492000000000004
2022	15.271
2023	15.049999999999997