Year	% of total population
1960	2.3383315234471
1961	2.2650707759754
1962	2.19457255010542
1963	2.12268018600204
1964	2.04328823360747
1965	2.03951049675668
1966	2.12266165541983
1967	2.22164203868902
1968	2.33182005777961
1969	2.4545964267832
1970	2.59126375218766
1971	2.6546431362193
1972	2.61471644258728
1973	2.55209794569656
1974	2.48793078283169
1975	2.42286924818451
1976	2.35915399074802
1977	2.29626986958418
1978	2.235035296393
1979	2.17567815077452
1980	2.12358140625215
1981	2.10078968390123
1982	2.10745312863635
1983	2.11884453612832
1984	2.12789303881637
1985	2.13663063409423
1986	2.1428444499729
1987	2.14632703516877
1988	2.14902040296977
1989	2.14609987618655
1990	2.13714816922858
1991	2.14936077622032
1992	2.1895684166862
1993	2.23989138230483
1994	2.29328415821891
1995	2.34185083548963
1996	2.3812496444127
1997	2.41456846589059
1998	2.44043162397293
1999	2.45480453525878
2000	2.46344747709581
2001	2.47289652820856
2002	2.48421640611793
2003	2.46955855813604
2004	2.41105955839036
2005	2.34383055722175
2006	2.28500984314309
2007	2.22564034551556
2008	2.16842805852423
2009	2.12085692302149
2010	2.13551002785412
2011	2.1952400713816
2012	2.23464097614617
2013	2.37672518949046
2014	2.63607585644341
2015	2.77309560970883
2016	2.77559640225558
2017	2.76404175081032
2018	2.80077278926567
2019	2.94818893332401
2020	3.1971229176382
2021	3.48870386132933
2022	3.75558760060398
2023	4.02787730404955