Year	% of tax revenue
1973	9.552715654952076
1974	10.959527057753524
1975	19.666666666666664
1976	13.322768092974115
1977	11.64134588498462
1978	12.600270392068499
1979	11.517410962163877
1980	17.939431782703714
1981	14.890900005552163
1982	19.340636838333165
1983	17.090088241329777
1984	15.770507011096443
1985	12.358837287003006
1986	13.11423921423065
1987	12.742780327260927
1988	11.049383833083006
1989	9.12830177390888
1990	4.835649850942739
1991	4.712053423842373
1992	4.332126207126207
1993	4.161350664300446
1994	3.4263753006530915