Year	% of relevant age group
1972	58.66517
1973	59.74607
1974	56.68494
1975	60.77675
1976	64.76317
1977	64.92667
1978	64.36326
1979	73.19177
1980	68.6904
1981	67.71838
1982	69.5893
1983	70.89357
1984	72.28229
1985	72.31546
1986	75.53075
1987	75.51141
1988	73.93239
1989	73.94963
1990	74.58936
1991	75.71285
1992	76.14473
1993	76.79098
1994	77.91316
1995	78.07904
1996	79.27419
1997	79.61373
1998	81.58948
1999	85.02563
2000	86.5464
2001	87.01084
2002	90.1073
2003	89.45976
2004	90.84183
2005	92.74723
2006	93.66429
2007	95.26777
2008	96.16787
2009	95.67139
2010	96.29583
2011	96.6885
2012	97.35661
2013	96.21512
2014	96.95838
2015	96.29388
2016	95.93212
2017	95.52034
2018	94.70981