Year	% of relevant age group
1972	83.46949
1973	83.63651
1974	78.20228
1975	83.56301
1976	88.10533
1977	85.21305
1978	84.18718
1979	87.35944
1980	84.74592
1981	84.29228
1982	85.61736
1983	86.72837
1984	86.92751
1985	85.80695
1986	89.47331
1987	88.65828
1988	87.73012
1989	86.69491
1990	86.75614
1991	87.15868
1992	86.94117
1993	87.46284
1994	87.94129
1995	87.61166
1996	88.44392
1997	88.39848
1998	89.58623
1999	92.24506
2000	93.42136
2001	93.01831
2002	96.01893
2003	95.28537
2004	95.73211
2005	97.5485
2006	98.50175
2007	99.86895
2008	100.069
2009	99.04034
2010	99.38992
2011	100.4294
2012	100.1492
2013	98.96838
2014	99.82464
2015	99.34782
2016	98.12749
2017	99.08325
2018	97.65121