Year	% of relevant age group
1974	69.4129104614258
1975	69.9024124145508
1976	69.553840637207
1977	72.5061264038086
1978	75.4971923828125
1979	69.5856628417969
1980	70.0196304321289
1981	74.8746871948242
1982	75.9284515380859
1983	70.0018463134766
1984	74.5635070800781
1985	74.7942199707031
1986	75.2071533203125
1987	75.518440246582
1988	75.2932891845703
1991	76.9013595581055