Year	% of relevant age group
1971	28.73194
1972	28.42734
1973	30.79888
1974	29.40597
1975	30.74581
1976	36.11732
1999	33.56219
2000	34.94526
2001	45.12984
2002	44.79967
2005	50.40943
2006	57.27453
2007	58.19891
2008	66.48595
2009	66.13632
2011	66.1663
2012	65.07262
2013	65.75152
2014	66.47236
2015	60.90226
2016	60.39127
2017	65.53597
2018	68.53382
2019	79.01084