Year	% of tax revenue
1996	1.471812601425245
1997	1.580606896272039
1998	0.9616844662651213
1999	2.98334198480487
2000	3.02638765717776
2001	0.5032389576534463
2002	0.3980689970816906
2003	0.4813274792712299
2006	0.5915536257172875
2007	0.5343278218774232
2008	0.6187404120822857
2009	0.4361850246053893
2010	0.009928751530115817
2011	0.007624760536836143
2012	0.007639672604411116
2013	0.006256662047381927
2014	0.006680724377595027
2015	0.003277983379085891
2016	0.005091212708809924
2018	0.012282687014951584
2019	0.00010623249331220084
2020	0.0020227168824831
2021	0.0005985241295333517