Year	% of relevant age group
1971	23.0323390960693
1972	23.7931804656982
1973	24.0796794891357
1974	20.9387493133545
1975	24.8629093170166
1976	26.5720996856689
1977	35.6234703063965
1978	40.8043899536133
1980	53.6676483154297
1983	47.4669189453125
1985	56.4412307739258
1986	55.5643882751465
1987	52.1316719055176
1988	57.3110504150391
1989	53.4711494445801
1993	55.3473014831543
1999	50.0989608764648
2000	48.7077407836914
2004	60.9578018188477
2007	53.2722396850586