Year	% of tax revenue
1972	1.6423357664233578
1973	2.0100502512562812
1974	1.4446227929373996
1977	21.92513368983957
1978	13.88888888888889
1979	30.87248322147651
1980	25.837320574162682
1981	26.436781609195403
1982	40.654205607476634
1983	40.609137055837564
1984	33.33333333333333
1985	48.8
1986	55.04587155963303
1987	75.9493670886076
1988	77.46478873239437
1989	77.38095238095238
1990	76.82926829268293
1991	75
1993	77.21518987341773
1994	64.76190476190476
1995	69.89247311827957
1996	79.12087912087912
1997	76.85185185185185
1998	70.33898305084746