Year	% of tax revenue
1972	4.872881355932203
1973	4.838263754492673
1974	5.411602843384545
1975	5.708204334365325
1976	4.8784692294431995
1977	8.285163776493256
1978	6.373682857877153
1979	5.081127241673783
1980	3.493907851206326
1981	4.918620491862049
1982	5.239813117274824
1983	3.482509485940018
1984	2.592515157850721
1985	3.016722408026756
1986	4.062870699881376
1987	4.130351437699681
1988	6.297198538367844
1989	9.538012051859516
1990	4.016035196387739
1991	4.075930957939454
1992	2.6096297232402375
1993	3.718818014398125
1994	0.7654732271527764
1995	4.473149239445978
1996	4.209925918884234
1997	3.014915324303596
1998	2.828274019091671
1999	2.785141806368081
2000	3.103569874911105
2001	3.0286622189901036
2002	2.8906691134952007
2003	2.63993661270889
2004	3.5110373582853396
2005	4.3199256868515965
2006	4.6116243555647705
2007	4.431587644875193
2008	3.4820897261115014
2009	3.10022663874633
2010	3.8140456320749028
2011	4.431016001963155
2012	4.2144058348522755
2013	4.689057255894319
2014	3.91569702524561
2015	4.075938285701838
2016	3.784050975567493
2017	3.907657373437888
2018	4.120937123572239
2019	3.8886506263588263
2020	3.5525743684576088
2021	3.5435749899653652
2022	4.223527478662194