Year	% of tax revenue
1991	7.626731618206726
1992	18.616842026435037
1993	14.636827771161176
1994	14.839080895136048
1995	14.095328797375178
1996	13.06996294706931
1997	14.063578676116787
1998	10.396543089072315
1999	10.906808185975414
2000	9.224718284233642
2001	7.573366667944399
2002	4.328165405496352
2003	3.559594998560421
2004	3.005952647909611
2005	2.745146407102581
2006	2.488190994836175
2007	2.3435075508204406
2008	2.547807493737983
2009	2.521603088648636
2010	2.4201738818022895
2011	2.6410922619205204
2012	2.582497017879414
2013	1.4674506745153637
2014	0.0003389712267007854
2015	0.00016253321010607118
2016	0.00035512825840974913
2017	8.202671610143424E-05
2020	0.000575857033390362