Year	% of total population
1960	3.51727588817182
1961	3.52512624800495
1962	3.53236852370301
1963	3.5418346078709
1964	3.55374646951321
1965	3.56683423397856
1966	3.58072471497796
1967	3.58324993368892
1968	3.59109715769128
1969	3.62179134075135
1970	3.66473351612644
1971	3.71989753719898
1972	3.78669445891958
1973	3.8613647394285
1974	3.94378741234034
1975	4.03001756916968
1976	4.11776620921403
1977	4.20473449784003
1978	4.28689494817959
1979	4.35429063601186
1980	4.37458882580834
1981	4.35861893483596
1982	4.36272793675903
1983	4.37892667860026
1984	4.37491197532164
1985	4.34966058831359
1986	4.30675425054654
1987	4.25246448930742
1988	4.18886978811207
1989	4.11955651311775
1990	4.06453902518794
1991	4.0458807489424
1992	4.02249941775692
1993	3.98300950966723
1994	3.9541394171013
1995	3.92756332937476
1996	3.90248590142377
1997	3.87984547544418
1998	3.85912446531604
1999	3.86746156045236
2000	3.88816178628151
2001	3.87966210307426
2002	3.85763629891583
2003	3.8428077806816
2004	3.90017439454464
2005	4.0188431252457
2006	4.12903172457135
2007	4.21827218209773
2008	4.27058022668295
2009	4.27872365924609
2010	4.25091155201639
2011	4.2058261033727
2012	4.1608934303797
2013	4.13058475748596
2014	4.12174718588549
2015	4.13152007866171
2016	4.1477717385478
2017	4.1946973993782
2018	4.26541596919286
2019	4.32055687458438
2020	4.33403294110642
2021	4.30378560548571
2022	4.27833816438977
2023	4.29516181087346