Year	% of total population
1960	19.688556067588326
1961	19.81912193541419
1962	19.96295508337101
1963	20.117135295196668
1964	20.2858693124564
1965	20.473888208894326
1966	20.70012857034815
1967	20.962928753307704
1968	21.245404843777056
1969	21.524177143837463
1970	21.77829558969878
1971	21.992049003122748
1972	22.215133284189
1973	22.468497348261636
1974	22.728169178642364
1975	23.02082946743366
1976	23.321849668386147
1977	23.634820795498733
1978	23.9761011437797
1979	24.23211141709178
1980	24.40179510710209
1981	24.577178377178377
1982	24.74784274016025
1983	24.911649828711077
1984	25.0833585738393
1985	25.24941559973407
1986	25.41417791476246
1987	25.596036681775058
1988	25.73734527313336
1989	25.752690858368204
1990	25.48590170762182
1991	25.038276225728406
1992	24.580691494818918
1993	24.133615686913316
1994	24.24755111375421
1995	24.90848530676584
1996	25.55427244790891
1997	26.107165821477352
1998	26.47674490121258
1999	26.739900394304616
2000	26.974801643606742
2001	27.105752255707184
2002	27.18504266038962
2003	27.362581913366686
2004	27.5258062709111
2005	27.6944416470701
2006	27.845525155353375
2007	27.984294943367605
2008	28.062577937241727
2009	28.306014625032017
2010	28.50625677536744
2011	28.72881538669182
2012	28.934123276892702
2013	29.014236881830225
2014	28.993518871521157
2015	28.940808681021217
2016	28.916419964560745
2017	28.90546791258808
2018	28.909669509243002
2019	28.959660616838896
2020	28.95286667046318
2021	29.090306071547023
2022	29.100294087383656
2023	28.780317868079297