Year	% of total population
1960	3.02795263788969
1961	3.09144943906478
1962	3.14038508842917
1963	3.18080395932241
1964	3.21355743890955
1965	3.24433149608898
1966	3.27687539385522
1967	3.30562984210889
1968	3.32981649417892
1969	3.37473314786058
1970	3.47242714065022
1971	3.54667742272141
1972	3.56395686083689
1973	3.56821685508736
1974	3.55208035179933
1975	3.50664382142298
1976	3.41897722233519
1977	3.33187946826465
1978	3.27783201110943
1979	3.24002205633223
1980	3.21503158327199
1981	3.20042840543033
1982	3.19400599400599
1983	3.19354147317282
1984	3.1960061587272
1985	3.20052677629146
1986	3.19358525795953
1987	3.17084465717492
1988	3.15485895471639
1989	3.15170897715694
1990	3.15127378956444
1991	3.1544905338334
1992	3.16211394950213
1993	3.17253883595911
1994	3.1856945524678
1995	3.20145313428699
1996	3.21898417122328
1997	3.23775750882447
1998	3.25987087922185
1999	3.29318428211755
2000	3.31993343853239
2001	3.33314410926555
2002	3.34789760859703
2003	3.36241222939769
2004	3.37526627595197
2005	3.38538320282868
2006	3.39359523498291
2007	3.40286433923415
2008	3.41414067027002
2009	3.42456475384757
2010	3.43305387648075
2011	3.43774211200225
2012	3.43911406618084
2013	3.44114086526491
2014	3.44465081008511
2015	3.4469363105148
2016	3.44896211124945
2017	3.45351550726034
2018	3.45878416197825
2019	3.4645544472313
2020	3.46286588140317
2021	3.4573660275962
2022	3.46644391441067
2023	3.49596751593174