Year	% of relevant age group
1979	19.21823
1981	17.39259
1984	18.48572
1985	17.05082
1987	17.98945
1988	18.25591
1999	47.78072
2000	49.87095
2001	55.01091
2002	62.2617
2003	61.62417
2004	64.34855
2005	65.11567
2006	73.02026
2007	74.46418
2008	77.34608
2009	74.45266
2010	75.43333
2011	76.69052
2012	64.65923
2013	65.99924
2014	60.09068
2015	62.36122
2016	62.6848
2017	76.13225