Year	% of tax revenue
2006	47.580454127608874
2007	51.2692641891784
2008	45.68095032591355
2009	41.99490874147672
2010	41.57298152439752
2011	40.117794607105004
2012	36.41740275108836
2013	34.81926895251372
2014	31.767002819446155
2015	32.551071899023505
2016	26.372202748051908
2017	35.20314119044496