Year	% of total population
1960	3.55676487234682
1961	3.57341630431472
1962	3.59329993850845
1963	3.61277070399558
1964	3.62727790651035
1965	3.63550153737849
1966	3.6379064587794
1967	3.63459781336638
1968	3.62718590595689
1969	3.6167689140436
1970	3.60339143565503
1971	3.58738042557092
1972	3.56806218919876
1973	3.5464798081809
1974	3.52453474211366
1975	3.49903334565178
1976	3.46912907150037
1977	3.43925895339974
1978	3.40829678452524
1979	3.37061718128965
1980	3.32916770534031
1981	3.29348744212901
1982	3.28423137372756
1983	3.31049944655085
1984	3.3537830471947
1985	3.39271035019923
1986	3.41652614780341
1987	3.42968783553728
1988	3.42501073963226
1989	3.39167803744131
1990	3.35037425039877
1991	3.31866295344123
1992	3.30269286517268
1993	3.29398481517003
1994	3.27481375180507
1995	3.24826633322503
1996	3.21837182839563
1997	3.18298567687749
1998	3.13933513813398
1999	3.09184763673985
2000	3.04186622336098
2001	2.99961494741558
2002	2.97390577090609
2003	2.94882473477236
2004	2.91281865723552
2005	2.87010947117475
2006	2.82529211730715
2007	2.77968576168536
2008	2.7321732936571
2009	2.68235480375206
2010	2.63675210978926
2011	2.60104454065864
2012	2.57689137011745
2013	2.56255791008678
2014	2.55469238117185
2015	2.55213563895011
2016	2.55756726636254
2017	2.57099532136453
2018	2.59026638549607
2019	2.61702567840046
2020	2.64763930388655
2021	2.67778778115654
2022	2.72087878515831
2023	2.77927199682849