Year	% of tax revenue
1972	16.27906976744186
1973	12.244897959183673
1974	12.5
1975	10.891089108910892
1976	9.67741935483871
1977	5.978260869565218
1978	5.9760956175298805
1979	8.333333333333332
1980	8.348794063079778
1981	9.824046920821115
1982	7.191780821917808
1983	3.855619360131255
1984	4.073789392774789
1985	4.955465587044534
1986	6.716494317600081
1987	6.380926661780024
1988	4.1497739381460805
1989	6.664550456496765
1990	8.037949966690404
1991	9.828451501049367
1992	10.764240360725132
1993	8.963324146703414
1994	8.40048388056347
1995	5.686137457079739
1996	5.440236140307188
1997	5.083099109622313
1998	5.47751054690985
1999	5.527202793663647
2000	5.128305167008179
2008	3.0622055334066873
2009	2.695222757995797
2010	1.9683784027244442
2011	2.0393947821149965
2012	2.0157822192307866
2013	1.9290291452088837
2014	1.9828477011238725
2015	1.9109952382208215
2016	1.9046495600255435
2017	1.8813604971357756
2018	2.1875709959015324
2019	2.0636390339280357
2020	1.7699096377683996
2021	2.1577454033997836
2022	2.4231990678786777