Year	% of total population
1960	3.33550078685131
1961	3.32940859574842
1962	3.31886134485166
1963	3.30496123559724
1964	3.28885376913585
1965	3.27068007735743
1966	3.25100955567782
1967	3.23012392879836
1968	3.20685338077163
1969	3.17987313456433
1970	3.15836198472069
1971	3.14696416821869
1972	3.14026707614885
1973	3.1358488871703
1974	3.13185474353016
1975	3.13560625102252
1976	3.14933702394589
1977	3.19144732315478
1978	3.30736713735725
1979	3.4577565272446
1980	3.41004997782955
1981	3.28901145483277
1982	3.25038694014773
1983	3.2156433790966
1984	3.18799028453306
1985	3.15773557966728
1986	3.12523794829459
1987	3.09611809273598
1988	3.08259531376078
1989	3.08492104583771
1990	3.09444642137306
1991	3.10377473485507
1992	3.11651993454683
1993	3.163025416219
1994	3.22501697733611
1995	3.24963754229962
1996	3.24044962275134
1997	3.21346240053214
1998	3.17183022634202
1999	3.1227919674847
2000	3.07569032410814
2001	3.02990665543613
2002	2.98291296762757
2003	2.94059740911359
2004	2.91391294290632
2005	2.90607110450702
2006	2.89687190046787
2007	2.89207689159242
2008	2.90259293617169
2009	2.91806422966906
2010	2.94034850545031
2011	2.96831630492903
2012	2.98909616352581
2013	2.99456567986469
2014	3.02818619818064
2015	3.09762593786182
2016	3.16741409886295
2017	3.23311798895554
2018	3.29335928925663
2019	3.34578073715007
2020	3.37626213602766
2021	3.36334256290234
2022	3.32184535349542
2023	3.29571879381174