Year	% of tax revenue
1972	30.088919652840634
1973	28.258464262004868
1974	24.523253828200602
1975	24.538305204559514
1976	24.326928223518706
1977	25.2423039152897
1978	24.9126135146054
1979	23.86529591231799
1980	21.790263118604358
1981	21.348062416441405
1982	18.637137028924883
1983	19.620807224474753
1984	22.007389604333323
1985	21.169750781401266
1986	19.6371294346347
1987	20.585782075992743
1988	23.560764821004867
1989	23.35464694293713
1990	23.899788449505525
1991	20.71029775964334
1992	18.637259566369877
1993	20.392841223853036
1994	19.23420857344258
1995	18.272030457950866
1996	16.269238254691874
1997	13.658916608886159
1998	10.191775496792943
1999	10.751395838158903
2000	12.905059606594953
2001	12.991679254878985
2002	12.255241215502888
2003	12.005507957384348
2004	10.00383052416549
2005	8.780987753339524
2006	7.136668897951139
2007	6.361894832585703
2008	6.428284451586983
2009	5.578667316171081
2010	5.74215173257134
2011	5.357313203042082
2012	6.0441682948376885
2013	4.997181725738855
2014	5.033241391340532
2015	4.515018953160258
2016	4.3455440676846635
2017	3.9527565879229973
2018	3.8354720538864995
2019	3.952729971302396
2020	3.713003728778758
2021	4.004165650558754
2022	4.007375674673659