Year	% of tax revenue
1990	0.4450156861119173
1991	0.951683748169839
1992	1.1614988385011615
1993	1.206055940467026
1994	2.7723672250357096
1995	1.6857926271961006
1996	0.691085003455425
1997	0.6865269094029668
1998	0.8349043899811474
1999	1.3121355179116911
2000	1.303088803088803
2001	1.2684935031519362
2002	2.331494241183799
2003	2.0090685163747537
2004	1.094181387914392
2005	1.289904038089042
2006	1.0888328738078668
2007	0.9821909353308953
2008	0.5232786176801472
2009	0.6781641895476599
2010	0.5729316340089232
2011	0.16131728607890386
2012	0.40693453238429456
2013	0.16939490384429914
2014	0.34242743920859153
2015	0.08845511190405717
2016	0.03789370570450587
2017	0.022592088475218857
2018	0.015521018773478697
2019	0.031086924595198618
2020	0.018319488365464445
2021	0.03771992729949484