Year	% of total population
1960	2.83302943728627
1961	2.81767412123129
1962	2.79905450373125
1963	2.77896791191492
1964	2.75892911923386
1965	2.73924697654934
1966	2.72152713232255
1967	2.70620567570727
1968	2.69199781279447
1969	2.67791015465783
1970	2.663022030701
1971	2.64957597034893
1972	2.63657327473071
1973	2.62251416366628
1974	2.61002671594322
1975	2.59985164574029
1976	2.5926484077707
1977	2.58448969625259
1978	2.57072830011139
1979	2.55017780566685
1980	2.52454795354536
1981	2.49797067644268
1982	2.46483335602466
1983	2.4281891009038
1984	2.38211604777245
1985	2.3269724672373
1986	2.2876186845665
1987	2.26533451622134
1988	2.2521684608102
1989	2.24954286067909
1990	2.24657394119533
1991	2.24616332161241
1992	2.25392088017408
1993	2.26506666780922
1994	2.27406917040731
1995	2.27980392367046
1996	2.28429438224573
1997	2.28646994496937
1998	2.28587834662079
1999	2.28535007609856
2000	2.28480734708738
2001	2.28484634471185
2002	2.28883394829011
2003	2.29391264258585
2004	2.29664737806727
2005	2.29941264028069
2006	2.30238096660512
2007	2.30571196902109
2008	2.31761413685953
2009	2.33529238260334
2010	2.35343107220261
2011	2.37388209171293
2012	2.39198468572599
2013	2.403284579283
2014	2.40916200256692
2015	2.40581576446341
2016	2.39898955450016
2017	2.39981758202619
2018	2.4070929738622
2019	2.41775383911968
2020	2.41695301478831
2021	2.40405843848977
2022	2.3943397190254
2023	2.39513967070057