Year	% of relevant age group
1973	45.6652793884277
1974	45.5488891601562
1975	45.9798393249512
1976	46.4401512145996
1977	47.1719093322754
1978	48.0285987854004
1979	48.2573318481445
1980	48.9598197937012
1981	49.9228782653809
1982	50.6131591796875
1983	51.0844612121582
1984	52.1622200012207
1985	52.4869689941406
1986	53.1259384155273
1987	52.684928894043
1988	52.5749015808105
1989	52.9055099487305
1990	53.4980392456055
1991	54.0450210571289
1992	53.4819602966309
1993	53.8193511962891
1994	52.9339294433594
1995	52.5756492614746
1996	52.7620811462402
1997	52.2481002807617
1998	51.8629493713379
1999	51.4247207641602
2000	51.8404502868652
2001	52.6681594848633
2002	53.3672103881836
2003	54.5198516845703
2004	55.4869613647461
2005	57.8841781616211
2006	59.7657318115234
2007	58.6079597473145
2008	58.7475090026855
2009	60.8859710693359
2010	62.711009979248
2011	62.5314788818359
2012	63.4242782592773
2013	63.1291313171387
2014	63.9203491210938
2015	64.3613204956055
2016	65.0770034790039
2017	65.4129104614258
2018	65.828742980957
2019	66.2129211425781
2020	66.7321701049805
2021	67.4801025390625