Year	% of total population
1960	44.71
1961	43.679
1962	42.838
1963	42.002
1964	41.168
1965	40.342
1966	39.52
1967	38.705
1968	37.894
1969	37.092
1970	36.296
1971	35.477000000000004
1972	34.634
1973	33.803
1974	32.980999999999995
1975	32.169
1976	31.366
1977	30.576999999999998
1978	29.798000000000002
1979	29.03
1980	28.272999999999996
1981	27.471999999999994
1982	26.626999999999995
1983	25.798000000000002
1984	24.985
1985	24.191999999999993
1986	23.433000000000007
1987	22.709000000000003
1988	22
1989	21.308999999999997
1990	20.632999999999996
1991	20.156999999999996
1992	19.872
1993	19.590999999999994
1994	19.311999999999998
1995	19.037000000000006
1996	18.777
1997	18.534000000000006
1998	18.293000000000006
1999	18.054000000000002
2000	17.816999999999993
2001	17.632000000000005
2002	17.497
2003	17.361999999999995
2004	17.227999999999994
2005	17.095
2006	16.962999999999994
2007	16.831999999999994
2008	16.700999999999993
2009	16.570999999999998
2010	16.230000000000004
2011	15.686999999999998
2012	15.159000000000006
2013	14.875
2014	14.825000000000003
2015	14.775000000000006
2016	14.724999999999994
2017	14.674999999999997
2018	14.617999999999995
2019	14.554000000000002
2020	14.483000000000004
2021	14.403999999999996
2022	14.319000000000003
2023	14.227000000000004