Year	% of total population
1960	3.78602676302822
1961	3.75077833511728
1962	3.71566445530201
1963	3.6765576034865
1964	3.63713001272975
1965	3.59997165957773
1966	3.56242291897179
1967	3.5245057190912
1968	3.48696025241008
1969	3.45366581055595
1970	3.42463411472927
1971	3.39614669066752
1972	3.36814103981036
1973	3.34102593156282
1974	3.31464878331994
1975	3.28805725606401
1976	3.26088930368617
1977	3.23339280536725
1978	3.20588316032817
1979	3.1771684727781
1980	3.14709904331235
1981	3.11665681089672
1982	3.08463323410612
1983	3.0521692489815
1984	3.02064704145718
1985	2.98900911518011
1986	2.95600850695359
1987	2.92335326496952
1988	2.89294906205285
1989	2.86371685320845
1990	2.83513696810668
1991	2.80733076369342
1992	2.78036834587441
1993	2.75477861641275
1994	2.73095756485928
1995	2.71065832992773
1996	2.69678400746488
1997	2.68845965716294
1998	2.68307256984393
1999	2.67950327116849
2000	2.67777669193833
2001	2.68000445269629
2002	2.68727347680856
2003	2.69728278537024
2004	2.70680080253095
2005	2.71527342444507
2006	2.72264590789595
2007	2.72933313982469
2008	2.73649702319053
2009	2.74502619967878
2010	2.75528815725851
2011	2.76922711566082
2012	2.78575914887894
2013	2.79557309549562
2014	2.79619140121119
2015	2.78637541820021
2016	2.77045135867567
2017	2.75700802098901
2018	2.74570941292387
2019	2.73673235649343
2020	2.71838453455283
2021	2.68903838518771
2022	2.66222891118971
2023	2.64935888643847