Year	% of relevant age group
1974	96.13252
1975	95.92818
1976	100.76057
1977	97.20787
1978	100.82648
1979	101.21357
1980	98.44945
1981	97.83312
1982	94.37623
1983	95.82826
1984	97.29197
1985	98.71671
1986	100.28968
1987	101.02875
1988	100.30735
1991	92.90625
2004	96.52641
2006	97.19709
2007	98.68844
2008	95.72138
2009	94.19689
2010	95.68203
2011	97.30054
2012	96.53183
2013	99.07903
2014	97.8669
2015	98.5835
2016	97.81686
2017	97.52346