Year	% of relevant age group
1974	68.2620162963867
1975	69.3219985961914
1976	68.9643402099609
1977	71.0357513427734
1978	75.635368347168
1979	68.2527313232422
1980	68.1422271728516
1981	73.0646133422852
1982	72.5307388305664
1983	67.4364776611328
1984	71.9515686035156
1985	72.2881698608398
1986	72.8342895507812
1987	73.2188415527344
1988	73.0957336425781
1991	73.9402618408203