Year	% of tax revenue
1972	22.22222222222222
1973	27.27272727272727
1974	25
1975	14.285714285714285
1976	14.634146341463413
1977	9.836065573770492
1978	6.315789473684211
1979	5.41871921182266
1980	4.751131221719457
1981	5.289421157684631
1982	6.525037936267071
1983	5.4363796650014695
1984	4.285982243341253
1985	4.7225439612509215
1986	4.8370724955303075
1987	3.6991620682607804
1988	2.85619437417533
1989	1.7099406249765428
1990	1.5994939737154417
1991	1.8436601982499758
1992	1.9010332579916047
1993	1.2878344409627767
1994	0.7612863500237902
1995	1.110988755521296
1996	1.0566731559593339
1997	1.0233140947752126
1998	0.9690384700322423
1999	1.0051953919132595
2000	0.9682189078858329
2001	0.922443248775581
2002	0.9474147538500584
2003	0.9656535227599384
2004	1.0567953515411421
2005	1.0860314390824788
2006	1.0582578193184013
2007	1.1578718956277587
2008	1.2892006116246966
2009	1.3472272968491767
2010	1.3661652142899705
2011	1.3672582745875348
2012	1.15809525487751
2013	0.9475878221864209
2014	1.080002445684306
2015	1.055010909580704
2016	1.1538488805904692
2017	0.9628828894473562
2018	0.9072680637266086
2019	0.9506231023106055
2020	0.9225606068103119
2021	0.9466064268149671
2022	0.6736950100366058