Year	% of relevant age group
1971	0.54474002122879
1972	0.730090022087097
1973	0.55349999666214
1974	0.905439972877502
1978	1.52751994132996
1981	2.89773988723755
1982	4.86392021179199
1983	4.20152997970581
1986	5.89555978775024
1987	4.53606986999512
1988	3.90111994743347
1989	4.31661987304688
1990	4.16856002807617
1991	4.32958984375
2005	6.66733980178833
2009	5.94790983200073
2012	7.5138897895813
2016	6.91483020782471
2017	8.34899997711182