Year	% of relevant age group
1974	70.6183090209961
1975	70.5095291137695
1976	70.1704711914062
1977	74.0471725463867
1978	75.3525314331055
1979	70.9853134155273
1980	71.9887313842773
1981	76.7710876464844
1982	79.493049621582
1983	72.6877593994141
1984	77.3041763305664
1985	77.4308395385742
1986	77.6998672485352
1987	77.9318923950195
1988	77.5939178466797
1991	80.0240020751953