Year	% of relevant age group
1970	66.84126
1971	67.07521
1972	68.36296
1973	68.52557
1974	76.02823
1975	78.02436
1976	80.27973
1977	82.00198
1978	86.09628
1979	88.47319
1980	91.46349
1981	93.91375
1982	94.58661
1983	91.49313
1984	88.99465
1985	87.72541
1986	85.61622
1987	84.71625
1988	84.90008
1989	84.60799
1990	82.90903
1991	81.6531
1992	81.62025
1993	83.19295
1994	83.62314
1995	86.79006
1996	87.8301
1997	94.69072
1998	91.59903
1999	91.9302
2000	95.678
2001	100.9003
2002	103.6587
2003	104.7022
2004	107.0507
2005	111.111
2006	110.2368
2007	112.7283
2008	114.9939
2009	112.2205
2010	110.494
2011	113.3727
2012	112.7688
2013	113.4175
2014	114.4941
2015	114.1359
2016	114.2498
2017	114.0785
2018	112.924