Year	% of tax revenue
1972	19.941262848751816
1973	20.0889721376727
1974	20.353063343717576
1975	19.71245452970722
1976	22.745701104431685
1977	25.631002903730156
1978	19.389587073608645
1979	19.836312728839115
1980	8.607014499938037
1981	8.416822930618803
1982	10.493205837946643
1983	9.454071461432301
1984	9.065155807365482
1985	9.389780569124607
1986	5.048337238378399
1987	4.583591786099044
1988	4.436308659176468
1989	3.5916478967553433
1990	2.906090336696803
1991	1.9573442685324065
1992	0.9962796540561444
1993	0.10256410256410264
1994	0.013039266820654203