Year	% of total population
1960	15.675260590500008
1961	16.073373711701826
1962	16.482946257820995
1963	16.895535041532327
1964	17.319284645957566
1965	17.756886613791657
1966	18.131267241564515
1967	18.372089742588088
1968	18.615801185600507
1969	18.86608403024876
1970	19.126942223945726
1971	19.424565363013322
1972	19.732515417907386
1973	20.045892277236103
1974	20.336323127017547
1975	20.60228875008759
1976	20.72006370055316
1977	20.805933053434938
1978	20.927775314361064
1979	21.030564182768767
1980	21.073455438703892
1981	21.04274419909771
1982	21.007101037261876
1983	20.982962297721574
1984	20.958261331862385
1985	20.961180395883147
1986	20.98532966430262
1987	20.943881192039168
1988	20.9259571938953
1989	20.88765349487358
1990	20.842046710681803
1991	20.823723958686085
1992	20.86875924867449
1993	20.966261312679485
1994	21.088223474972942
1995	21.153223843705714
1996	21.218998646859315
1997	21.26342052872406
1998	21.300608235018867
1999	21.338154879012123
2000	21.376787783952295
2001	21.416687420626012
2002	21.5132622452328
2003	21.58473998486838
2004	21.524499948211403
2005	21.469179412857518
2006	21.425936973118443
2007	21.385331009221485
2008	21.458227712777006
2009	21.530463744301965
2010	21.564299269151874
2011	21.23507044267079
2012	21.007461976953746
2013	20.818163001061983
2014	20.665574833993865
2015	20.748264497974244
2016	20.925628305702542
2017	20.983207055073375
2018	21.038515078912003
2019	21.062911966257992
2020	21.114009650536698
2021	21.191434193812885
2022	21.274978003841174
2023	21.35567344943562