Year	% of relevant age group
1972	67.17309
1973	71.99403
1974	71.62322
1975	70.83251
1976	77.00811
1977	79.85917
1978	77.74479
1979	76.51241
1980	77.06643
1981	75.57289
1982	75.86198
1983	77.10332
1984	80.84498
1985	78.41196
1986	83.88419
1987	86.68737
1988	86.5415
1989	83.70779
1990	85.66834
1991	90.13353
1992	93.19811
1993	87.8699
1994	89.57208
1995	87.73663
1996	93.5088
1997	92.92065
1999	97.15023
2000	95.24234
2001	83.03262
2002	98.84218
2003	95.04566
2004	97.16826
2005	96.57535
2006	96.04057
2007	100.03889
2008	104.81314
2009	104.89546
2010	113.04104
2011	110.30516
2012	112.97008
2013	112.4812
2014	110.6627
2015	107.19818
2016	104.13991
2017	101.22459
2018	101.50776