Year	% of tax revenue
1990	44.121212121212125
1991	46.285714285714285
1992	50.571131879543096
1993	47.801147227533455
1994	46.99907663896584
1995	45.11848341232228
1996	41.054451166810715
1997	45.60394412489729
1998	48.13971146545178
1999	47.19551282051282
2000	43.789308176100626
2001	41.371841155234655
2002	36.40588690937258
2003	36.165577342047925
2004	27.38609112709832
2005	85.09174311926606
2006	84.52058171062362
2007	85.57075673364686
2008	82.573030886415
2009	70.85991324317428
2010	88.82342595849455
2011	84.33715247229196
2012	83.51801237910452
2013	87.9144385026738