Year	% of total population
1960	4.47218766179026
1961	4.39975292254516
1962	4.33991647561238
1963	4.28907324156895
1964	4.24537094476301
1965	4.20596138543709
1966	4.16927129970344
1967	4.12374050927009
1968	4.06797535132753
1969	4.01266715861481
1970	3.95810769417913
1971	3.9043136056097
1972	3.8529330813075
1973	3.80678063262599
1974	3.76503038620212
1975	3.73147889292703
1976	3.71291669535133
1977	3.70991977194683
1978	3.71785120707626
1979	3.73152781780335
1980	3.74955822465808
1981	3.77343565684433
1982	3.80160158667132
1983	3.82949832421875
1984	3.85516253757309
1985	3.87846331130694
1986	3.89898017403375
1987	3.92324268263899
1988	3.95274243496548
1989	3.9812313057926
1990	4.00903948144438
1991	4.03698368333152
1992	4.06597876682735
1993	4.09755510273787
1994	4.13358441822173
1995	4.1724521522782
1996	4.21201500180937
1997	4.25737175985645
1998	4.31042601399348
1999	4.36654409718374
2000	4.4204780274488
2001	4.46687702209532
2002	4.50180184712797
2003	4.52464338218692
2004	4.534765063081
2005	4.52566065750188
2006	4.48340230071126
2007	4.42205937589017
2008	4.35079762618148
2009	4.27729076050845
2010	4.21960828516863
2011	4.17527021585615
2012	4.14735744759135
2013	4.14421642686126
2014	4.17159350290002
2015	4.17888332919129
2016	4.15869044420562
2017	4.15303574974304
2018	4.16213796344614
2019	4.18710685148031
2020	4.21094893749168
2021	4.20782005514465
2022	4.19541721609029
2023	4.21961814216303