Year	% of relevant age group
1970	17.9840908050537
1971	17.8370399475098
1972	18.2605895996094
1973	18.3106002807617
1974	18.2152805328369
1975	18.5939693450928
1976	18.6530704498291
1977	18.7532997131348
1978	19.1880302429199
1979	19.4783706665039
1980	19.8867206573486
1981	20.1361103057861
1982	20.184419631958
1983	20.308069229126
1984	20.5306701660156
1985	20.6447906494141
1986	20.7072105407715
1987	20.4852695465088
1988	20.6070194244385
1989	20.6393394470215
1990	20.8861904144287
1991	21.1011600494385
1992	21.0464096069336
1993	21.5391693115234
1994	21.6681098937988
1995	22.4108695983887
1996	22.5517406463623
1997	22.7529697418213
1998	22.9778594970703
1999	23.1590194702148
2000	23.6321907043457
2001	24.6531505584717
2002	26.6327705383301
2003	28.4535007476807
2004	29.3511695861816
2005	30.3029499053955
2006	31.42214012146
2007	32.6961898803711
2008	34.5271415710449
2009	35.9685707092285
2010	37.4767913818359
2011	38.8517112731934
2012	39.7686195373535
2013	40.2382011413574
2014	41.0527305603027
2015	41.7949485778809
2016	42.263671875
2017	42.6057395935059
2018	42.9364318847656
2019	43.0605201721191
2020	43.4539794921875