Year	% of tax revenue
1973	17.540687160940323
1974	20.570264765784113
1975	25.430107526881716
1976	18.095238095238095
1977	19.05069422021311
1978	21.83474709393654
1979	24.778270509977826
1980	24.73726758286176
1981	28.611698379140236
1982	30.986527596697087
1983	26.618861364624074
1984	25.05976961530102
1985	26.17914322803981
1986	23.268571428571427
1987	23.46215412760119
1988	29.976649153531813
1989	27.23508375682289
1990	23.28767123287671
1991	27.328244274809162
1992	23.23489612353737
1993	24.289739375440245
1994	21.018854783344114
1995	20.680975092739796
1996	25.601938960997543
1997	17.342046167229764
1998	9.51405927311881
1999	8.914651540783494
2000	7.244443857540904
2001	7.867006267635528
2002	4.703990618670267
2003	2.698028363887928
2004	7.27455705746136
2005	3.8679512312740463
2012	15.865481226488887
2013	11.323499721515148
2014	13.012712292942116
2015	10.69882783953227
2016	8.397124314652546
2017	9.003221505158093
2018	9.613799174984242
2019	6.843034817158595