Year	% of total population
1960	10.6034471281244
1961	10.7877992835705
1962	10.9646277024219
1963	11.1244694296631
1964	11.2756388198303
1965	11.4175140010565
1966	11.5479141348214
1967	11.6958432326269
1968	11.886280145957
1969	12.0915546621565
1970	12.3052303759717
1971	12.5205127793441
1972	12.7263930344388
1973	12.9411004833505
1974	13.1711026313816
1975	13.4020533974272
1976	13.6161824913222
1977	13.8445060979781
1978	14.0786916242736
1979	14.2722361924504
1980	14.4255683832994
1981	14.560293864947
1982	14.6970640984176
1983	14.8363254797236
1984	14.9559468527023
1985	15.1066168800879
1986	15.299512498513
1987	15.4328426023617
1988	15.5184724002055
1989	15.5887400100897
1990	15.614096930514
1991	15.6024290830841
1992	15.5597009662313
1993	15.4773247322685
1994	15.3708825972307
1995	15.2494371510219
1996	15.1331119675914
1997	15.0357900030536
1998	14.9524475598378
1999	14.8827674594077
2000	14.8384046526128
2001	14.8216149293331
2002	14.8306736743118
2003	14.8736044978509
2004	14.9539218839845
2005	15.0721559880894
2006	15.214906855969
2007	15.4273702206061
2008	15.7346116515176
2009	16.1175651213473
2010	16.5760153605345
2011	17.0917102820365
2012	17.6082687260995
2013	18.0509705603235
2014	18.420332873062
2015	18.749731409864
2016	19.0393416200897
2017	19.3003414768781
2018	19.5549922433786
2019	19.8025648573003
2020	20.0469184421079
2021	20.2687265752065
2022	20.4869504696451
2023	20.7191088753971