Year	% of tax revenue
1973	15.676686322450742
1974	17.413224743067676
1975	9.751889582648703
1976	5.131057498435653
1977	0.3938200545289306
1978	1.6951650943396228
1979	1.1694440963956063
1980	1.4266065316828198
1981	1.8750663975353237
1982	0.958660794666537
1983	0.8583875190454732
1984	0.8222473564208901
1985	0.8417074637121017
1986	1.4280974568325087