Year	% of tax revenue
2002	3.880509790332175E-05
2003	9.439699948756771E-05
2004	2.513285857363488E-05
2005	0.00015081060310516645
2006	7.24238090665049E-05
2007	0.00016496364201330026
2008	3.697831000248494E-05
2009	6.52079304841728E-05
2010	1.9231801090866222E-05
2011	5.255959075000259E-05
2012	2.64858799359748E-05
2014	1.8060213756096972E-06
2015	1.5222736261433422E-05
2016	1.632342035587072E-05
2017	2.4729624228685744E-06
2018	4.585809104425434E-05