Year	% of relevant age group
1972	28.7070598602295
1973	29.3428192138672
1974	29.5021705627441
1975	30.043529510498
1976	29.7221794128418
1977	29.7321891784668
1978	31.1318492889404
1979	31.8808097839355
1980	32.8388900756836
1981	34.2481002807617
1982	35.3642387390137
1983	36.4647789001465
1984	38.935920715332
1985	37.9361686706543
1986	38.7719306945801
1987	39.064640045166
1988	39.0003814697266
1989	38.8877105712891
1990	39.8373413085938
1991	40.9162292480469
1992	40.9163284301758
1993	41.8692588806152
1994	41.7811088562012
1995	42.2730293273926
1996	43.1606712341309
1997	43.3425903320312
1998	43.6546211242676
1999	45.0250816345215
2000	45.7678413391113
2001	47.4352111816406
2002	49.1806983947754
2003	50.9279518127441
2004	52.1735305786133
2005	55.050048828125
2006	57.0063018798828
2007	58.1156997680664
2008	60.1601104736328
2009	64.0626983642578
2010	65.3158874511719
2011	65.3841171264648
2012	66.4175796508789
2013	65.5653686523438
2014	66.0141906738281
2015	66.3564224243164
2016	67.265251159668
2017	67.9415817260742
2018	68.6506576538086
2019	68.7416305541992
2020	69.2613525390625
2021	69.9701995849609