Year	% of tax revenue
1972	22.340425531914892
1973	21.25984251968504
1974	20.555555555555554
1975	15.311004784688995
1976	15.079365079365079
1977	16.358024691358025
1978	17.277486910994764
1979	18.491484184914842
1980	17.04781704781705
1981	12.729844413012732
1982	8.022690437601296
1983	8.739837398373984
1984	17.757398916215088
1985	20.441568328892274
1986	21.71918017742429
1987	23.78865351838325
1988	39.78996499416569
1989	38.56433099194792
1990	27.464479273472975
1991	27.25420821271577
1992	20.95534937663091
1993	21.009940842837104
1994	20.513761467889907
1995	19.381184231192083
1996	11.30820399113082
1997	12.564511335080656
1998	10.96980036780183
1999	7.342245489389549
2000	6.9011950850025245
2001	6.495726495726497
2002	6.345145838035764
2003	5.837075048107762
2004	6.260269606740076
2005	6.320255156543747
2006	6.578167873217135
2007	6.702455092983484
2008	6.5636089331217065
2009	5.255486146624995
2010	5.146979683269932
2011	5.336433275077916
2012	5.075956674485969
2013	4.678894248782315
2014	4.743051716115175
2015	4.448451081503017
2016	4.284020880660068
2017	3.939487772087059
2018	3.6938839465372095
2019	3.245694077276943
2020	3.3539787380376147
2021	3.2244942028988444
2022	2.6617604013915996