Year	% of relevant age group
1977	6.8500599861145
1978	8.49932956695557
1979	9.75710964202881
1980	10.0629501342773
1981	12.0545196533203
1982	12.2740602493286
1983	14.5623397827148
1985	17.033130645752
1986	14.7496700286865
1987	16.1409797668457
1988	17.1457500457764
1989	18.0861892700195
1990	18.3376998901367
1991	18.6045303344727
1997	25.4213008880615