Year	% of relevant age group
1971	70.77598
1972	71.32188
1973	71.93404
1974	67.66078
1975	72.40052
1976	76.67451
1977	75.27672
1978	74.47687
1979	80.41983
1980	76.88116
1981	76.1722
1982	77.76473
1983	78.96949
1984	79.75037
1985	79.1945
1986	82.63981
1987	82.21308
1988	80.9655
1989	80.44721
1990	80.79373
1991	81.55153
1992	81.65487
1993	82.2398
1994	83.03445
1995	82.9467
1996	83.95419
1997	84.09865
1998	85.67238
1999	88.71202
2000	90.05767
2001	90.08049
2002	93.12643
2003	92.4345
2004	93.33924
2005	95.19962
2006	96.13548
2007	97.6186
2008	98.1613
2009	97.39306
2010	97.87708
2011	98.60017
2012	98.78386
2013	97.62239
2014	98.42353
2015	97.8552
2016	97.05477
2017	97.34269
2018	96.21463