Year	% of relevant age group
1970	77.58519
1971	77.60565
1972	77.855
1973	79.2384
1974	75.71124
1975	83.36099
1976	86.80162
1977	86.71732
1978	86.69885
1979	92.41902
1980	88.44207
1981	86.82772
1982	87.95509
1983	90.03448
1984	90.29665
1985	88.91549
1986	94.13654
1987	92.32557
1988	91.96851
1989	90.77335
1990	91.31659
1991	92.99123
1992	92.51103
1993	91.36699
1994	90.50133
1995	89.60943
1996	90.94964
1997	91.46729
1998	93.17903
1999	96.13136
2000	97.15267
2001	97.71763
2002	100.7361
2003	100.8175
2004	101.0789
2005	102.4889
2006	102.7348
2007	103.9866
2008	103.1862
2009	103.7095
2010	104.5362
2011	105.3633
2012	105.5407
2013	104.4266
2014	104.1323
2015	102.8193
2016	102.0472
2017	103.1622
2018	102.2142