Year	% of relevant age group
1973	59.3112
1974	60.94275
1975	65.03674
1976	68.19095
1977	70.50203
1978	73.61035
1979	72.79709
1980	74.52685
1981	79.8457
1982	81.46489
1983	78.86896
1984	79.55611
1985	79.2303
1986	80.98097
1987	80.53052
1988	78.07142
1989	76.09063
1990	75.88941
1991	75.27356
1992	76.49286
1993	77.19728
1994	77.90534
1995	81.72247
1996	83.30758
1997	91.59847
1998	89.67559
1999	88.55708
2000	95.40393
2001	99.0536
2002	104.5369
2003	105.8466
2004	108.3035
2005	112.2212
2006	113.5315
2007	113.6771
2008	118.7638
2009	117.4049
2010	117.1953
2011	121.0265
2012	120.2498
2013	121.7561
2014	121.2813
2015	119.4054
2016	118.2862
2017	117.5027
2018	117.1285