Year	% of relevant age group
1971	27.94572
1972	27.6715
1973	25.71698
1974	27.56215
1976	29.5056
1977	27.16246
1978	28.77631
1979	25.28052
1980	27.67998
1981	23.41747
1983	24.78623
1984	24.70406
1985	22.6839
1986	23.17039
1987	23.49608
1988	24.05457
1999	55.31319
2000	57.00455
2001	63.12068
2002	69.06627
2003	67.52692
2004	70.65526
2005	71.67093
2006	78.68739
2007	79.76308
2008	82.65343
2009	79.86862
2010	79.67502
2011	80.37081
2012	67.90996
2013	62.12302
2014	63.61255
2015	65.3733
2016	67.32876
2017	80.1129