Year	% of total population
1960	3.8176386825161
1961	3.65474748538628
1962	3.49829289155658
1963	3.34659090909091
1964	3.2009766392849
1965	3.06856909469512
1966	2.95017837532247
1967	2.85206339599803
1968	2.76099875278179
1969	2.64672582528646
1970	2.51440785580078
1971	2.38040881781381
1972	2.24788805334081
1973	2.1199326972316
1974	2.00221681234532
1975	1.90570486082179
1976	1.83405242997707
1977	1.78773363734152
1978	1.97085171814414
1979	2.77215447771222
1980	3.37983945022068
1981	3.41558645677368
1982	3.45946382755207
1983	3.50906953441216
1984	3.56117129811431
1985	3.61293278945906
1986	3.66663613884055
1987	3.72009774500557
1988	3.77000923168034
1989	3.82012623912054
1990	3.83245240501715
1991	3.80856944287307
1992	3.78710725039807
1993	3.76288850062751
1994	3.73590218510502
1995	3.70578771067601
1996	3.67313531504254
1997	3.63334470092972
1998	3.58707288298523
1999	3.53461522045328
2000	3.5335339504566
2001	3.56335343989728
2002	3.57129605121571
2003	3.58393021275364
2004	3.60415494665088
2005	3.63272948663458
2006	3.66225930536397
2007	3.68938161418383
2008	3.71613895983159
2009	3.7575853660063
2010	3.77791267574648
2011	3.76948912429266
2012	3.76175365847497
2013	3.75720733796652
2014	3.75323698629629
2015	3.74567941874956
2016	3.72875311597427
2017	3.70711723786259
2018	3.69898216604215
2019	3.70395312815678
2020	3.71336445449733
2021	3.72317174625905
2022	3.73736956391999
2023	3.75733170705458