Year	% of relevant age group
1970	61.44223
1971	61.38853
1972	61.96461
1973	63.98666
1974	61.16561
1975	69.48765
1976	73.64904
1977	74.74155
1978	74.76775
1979	83.81425
1980	78.71267
1981	76.95335
1982	78.33366
1983	80.7664
1984	82.30941
1985	81.91229
1986	86.78263
1987	85.7806
1988	85.30481
1989	85.00227
1990	86.05422
1991	88.18695
1992	87.98953
1993	86.80138
1994	86.33538
1995	85.60683
1996	87.18583
1997	87.88106
1998	90.01109
1999	93.39056
2000	94.49929
2001	95.49175
2002	98.76238
2003	98.92672
2004	99.48743
2005	100.7148
2006	101.223
2007	102.5879
2008	102.2654
2009	102.799
2010	103.517
2011	104.2952
2012	104.7142
2013	103.9484
2014	103.3902
2015	102.1377
2016	101.4674
2017	102.5281
2018	101.843