Year	% of relevant age group
1970	68.73531
1971	68.32994
1972	72.10085
1973	64.04671
1974	67.46603
1975	69.52182
1976	71.77655
1977	71.37066
1978	71.33073
1979	79.88558
1980	79.73879
1981	80.40883
1982	79.98995
1983	79.28207
1984	80.33811
1985	81.15209
1986	81.25981
1987	79.37455
1988	77.71929
1989	78.62765
1990	77.57055
1991	76.79244
1992	77.75094
1993	78.37638
1994	76.46172
1995	77.84391
1996	79.08471
1997	79.72127
1998	80.98225
1999	76.78875
2000	85.30526
2001	88.95111
2002	91.391
2003	94.22851
2004	93.80213
2005	93.41857
2006	96.8542
2007	99.17517
2008	102.5625
2009	102.7278
2010	103.3017
2011	106.0496
2012	107.6345
2013	107.9832
2014	107.7219
2015	108.3903
2016	109.414
2017	109.4482
2018	110.0383