Year	% of tax revenue
1990	49.19831223628692
1991	48.775055679287306
1992	47.656813266041816
1993	51.037344398340245
1994	49.06148867313916
1995	51.58536585365854
1996	47.92833146696528
1997	50.75090626618333
1998	47.19101123595505
1999	49.33577645442052
2000	35.624785821610274
2001	37.447116777745585
2002	37.939376168309934
2003	39.66103063126532
2004	38.26017607243652
2005	36.66765957171257
2006	35.44205344579842
2007	18.86017983419147
2008	10.29739795557476
2009	10.700213487173663
2010	11.425493500338971
2011	11.433876739772362
2012	11.05583491945523
2013	11.489574058347023
2014	16.72787837376153
2015	17.210423506919913
2016	11.693842102314115
2017	12.954256319486698