Year	% of total population
1960	11.9871187219592
1961	12.1158559842434
1962	12.2722054505205
1963	12.3822036328483
1964	12.5052577587836
1965	12.6594286336586
1966	12.8265344336087
1967	13.0094602552676
1968	13.1519787983869
1969	13.2713170212988
1970	13.3995910015353
1971	13.5156022488218
1972	13.6361120039817
1973	13.7622918632645
1974	13.878680359536
1975	13.9824228771253
1976	14.0588611881246
1977	14.1627590649386
1978	14.2932512996794
1979	14.4086746704613
1980	14.4367188251524
1981	14.3010201103936
1982	14.0580181727479
1983	13.7761930939868
1984	13.6276542308608
1985	13.7432392954045
1986	13.9769554749962
1987	14.2138840024943
1988	14.4686804137328
1989	14.7112658835463
1990	14.9425318516816
1991	15.1659495727976
1992	15.3636990332408
1993	15.5436743001622
1994	15.7320425830023
1995	15.9570124330399
1996	16.1911769361744
1997	16.403593447382
1998	16.5740519677137
1999	16.7027549924222
2000	16.80178248144
2001	16.882712820533
2002	16.9608843782937
2003	17.0424022454878
2004	17.1308642152415
2005	17.1694140655234
2006	17.1142141033122
2007	17.0445159574426
2008	17.0501018205386
2009	17.1204283461989
2010	17.203178007908
2011	17.3688456076802
2012	17.5984539040595
2013	17.8041767384111
2014	18.0157189186848
2015	18.2121641721349
2016	18.388947228713
2017	18.5780135332375
2018	18.783552969445
2019	19.0117768297794
2020	19.2076193876575
2021	19.417070410728
2022	19.7290949756905
2023	20.0926268211745