Year	% of tax revenue
2003	9.893944303016278
2004	10.931516107231358
2005	8.836356852458566
2006	8.405600236241604
2007	8.939047034936708
2008	9.01792868586636
2009	8.063393677969124
2010	8.521521798736366
2011	8.091509138751915
2012	8.916820386948828
2013	8.970347623800464
2014	10.125874098749064
2015	9.674283575900382
2016	9.2316531130631