Year	% of tax revenue
1973	19.047619047619047
1974	11.464968152866243
1975	13.488975356679637
1976	11.75996778091019
1977	12.036872894876796
1978	10.19350745479539
1979	7.718696397941681
1980	6.917335064212528
1981	7.891432791728213
1982	5.151360477443166
1983	8.467341671629939
1984	12.696690179055887
1985	14.775720483421134
1986	11.459048665476354
1987	13.647107558847896
1988	14.084921708029835
2000	8.085076278892906
2001	7.061168004428453
2002	5.6089270068679165
2004	2.6208045199426135
2005	2.305150318368663
2006	1.9626226639164948
2007	1.635061038033538
2008	1.7738280291557
2009	1.1607229636668315
2010	1.3903417529449058
2011	1.2731292719092573
2012	1.2681922076320606
2013	1.2630305558452393
2014	1.3369188281990183
2015	1.1622733404449446
2016	1.0449030263359236
2017	0.9812076902247495
2018	0.9929390537966907
2019	0.8753270126681959
2020	0.8227226795635114
2021	1.03288815398906
2022	1.0614113088282018