Year	% of tax revenue
1972	0.5738132498695859
1973	0.47596382674916626
1974	0.154320987654321
1975	0.07293946024799426
1976	0.05936479667557139
1977	0.08172160174339421
1978	0.07185628742514971
1979	0.06098800569221381
1980	0.10495014867937726
1981	0.07717240314863405
1982	0.06636580833554552
1983	0.06026274557068839
1984	0.06611570247933878
1985	0.061431350465854274
1986	0.06663493574488305
1987	0.05261209648000871
1988	0.038250231988514606
1989	0.01657795439364314
1990	0.0230943671371018
1991	0.020963184514407016
1994	0.013540961408260006
1995	0.00885646205427746
1996	0.003917205935350433
1997	0.014296868985692133
1998	0.012206835185238725
1999	0.007248893788604134
2000	0.00549340935440875
2001	0.0019468997012899601
2002	0.0013953696055011052
2003	-0.0013863780042811353
2004	-0.002912665062053005
2005	0.018541236471882088
2006	-0.06087156578922141
2007	-0.022818982599361534
2008	-0.024861550813360462
2009	-0.024197551806459498
2010	-0.02465646467390684
2011	-0.003785660363913304
2012	-0.026773022142989187
2013	-0.007732708747525024
2014	-0.023297102322480095
2015	-0.023530057687858097
2016	-0.021929058525358144
2017	-0.02339620834047194
2018	-0.022232686951513484
2019	-0.01974637620528199
2020	0.005423733558214157
2021	0.007004786604179523
2022	0.006771856165775038