Year	% of tax revenue
2000	15.257625385439097
2001	13.521205196095435
2002	13.090634306796462
2003	16.19053806051354
2004	14.657994640996755
2005	15.525228551126474
2006	15.714320468940176
2007	15.998832727478138
2008	14.911951236339318
2009	12.9433656807456
2010	13.619218984040455
2011	13.825099686149903
2012	13.699111741704186
2013	11.534723090598751
2014	11.868939927791287
2015	0.4379242391066345
2016	0.5176680091523704
2017	0.6101157186146307