Year	% of total population
1960	3.72085583597905
1961	3.62411568070871
1962	3.5394099656614
1963	3.46684396130206
1964	3.40797761080161
1965	3.36273020605806
1966	3.33128954513756
1967	3.31301273647513
1968	3.30552869252757
1969	3.30567287837806
1970	3.31197776952918
1971	3.31251543384644
1972	3.31432714885852
1973	3.32686042429284
1974	3.34144787215694
1975	3.35815616476924
1976	3.37655465527628
1977	3.39559486359801
1978	3.41462882081327
1979	3.43052411527739
1980	3.43815370144422
1981	3.43901928703102
1982	3.43911018190308
1983	3.4429075454369
1984	3.45242712196084
1985	3.46104438004164
1986	3.46497135522452
1987	3.46438382185595
1988	3.46057915876763
1989	3.45695230489777
1990	3.45409317708878
1991	3.45210427382422
1992	3.45526765907624
1993	3.45815854931652
1994	3.45735325278792
1995	3.45515903561753
1996	3.45212123459099
1997	3.45170754028326
1998	3.45328944759248
1999	3.45739009369632
2000	3.46170282321867
2001	3.46711990179335
2002	3.4793365292337
2003	3.49779309038928
2004	3.52026843229087
2005	3.54733760214321
2006	3.57986862182267
2007	3.61632861909893
2008	3.65537300998099
2009	3.69454947486636
2010	3.73064191089064
2011	3.76591887670753
2012	3.80344540013963
2013	3.84076051316904
2014	3.87458676643475
2015	3.90610391091125
2016	3.94366646977388
2017	3.99253709873971
2018	4.05000140182463
2019	4.11555959972365
2020	4.17417916257474
2021	4.22141428425526
2022	4.27369845280838
2023	4.34670786967826