Year	% of tax revenue
1972	32.28858663512714
1973	32.436974789915965
1974	30.833333333333336
1975	25.202101859337105
1976	23.289533303126415
1977	24.613189948425326
1978	24.753506457436465
1979	21.927196804647785
1980	20.112754642410856
1981	20.69341205827051
1982	19.3014301430143
1983	18.08201348263739
1984	18.829215444973862
1985	17.139862498795257
1986	15.119352242284451
1987	15.057204612581621
1988	10.545988291717158
1989	10.39102978207275
1990	10.358732959789503
1991	11.399728899855004
1992	10.317917788943445
1993	6.312053589358226
1994	1.7293697251709765
1995	1.6744979542267266
1996	1.5659773648779942
1997	1.5502831979387155
1998	1.611153875281664
1999	1.5042263767731878
2000	1.5154982728108075
2001	1.6542921702857256
2002	1.282150655579013
2003	1.2911926267395912
2004	1.2840373134280108
2005	1.2238921329635017
2006	1.4016448028711528
2007	1.5127831679659232
2008	1.6180812223881056
2009	1.6375209334836782
2010	1.75047920034773
2011	2.0060962477805444
2012	1.9360813364580929
2013	1.3629354415381894
2014	1.185601370207146
2015	0.9514616635823661
2016	0.5383680969205481
2017	0.6188969037164922
2018	0.6300940140389536
2019	0.5167493102953109
2020	0.39244639884060495
2021	0.5876742369936839
2022	0.6851347733585615