Year	% of total population
1960	18.140284317846803
1961	18.1893868986744
1962	18.262627495419775
1963	18.347638027836584
1964	18.42300788500998
1965	18.505400359777628
1966	18.583716332603146
1967	18.649318305769704
1968	18.71329582290632
1969	18.770657294113064
1970	18.82347592501773
1971	18.881871364433035
1972	18.93833806046244
1973	18.990083928813643
1974	19.018506077078115
1975	19.02000137564305
1976	19.02885614874385
1977	19.053710493517535
1978	19.101591023229027
1979	19.181061703907044
1980	19.2062418857707
1981	19.164835049937228
1982	19.136026363932302
1983	19.12472123248848
1984	19.122889325601243
1985	19.117690560352223
1986	19.110274864061775
1987	19.102331810415425
1988	19.09157251832612
1989	19.260304535925833
1990	19.329191435347717
1991	19.109154182813732
1992	18.897642579215017
1993	18.70307215344827
1994	18.514447198225334
1995	18.328148076791816
1996	18.149343463898322
1997	17.97818878525271
1998	17.81392422201378
1999	17.660089884962485
2000	17.50320317235256
2001	17.407487315922847
2002	17.414049247692205
2003	17.420898772226057
2004	17.41637055604025
2005	17.408027012812944
2006	17.392132351408
2007	17.376106080284178
2008	17.36353214345059
2009	17.347597691229367
2010	17.34394010893775
2011	17.350224289132665
2012	17.463042175275458
2013	17.556510701114174
2014	17.649487131565216
2015	17.7373669972289
2016	17.835957792232605
2017	17.92972104725333
2018	17.99893080337871
2019	18.052272503282882
2020	18.13380492954518
2021	18.248042125292653
2022	18.409189708482216
2023	18.540935687149943