Year	% of tax revenue
1985	15.455475946775845
1986	18.712108798951334
1987	19.093213179386087
1988	17.00775390873268
1989	14.579169442593825
1990	13.002237136465325
1991	11.14185939250181
1992	11.974275214373213
1993	10.504382196253651
1994	10.860168575751027
1995	11.161455009572432
1996	8.189048042126249
1997	8.980896567470888
1998	8.776880872800657
1999	8.29093292398972
2000	8.116254372813593
2001	7.338112015550966
2002	6.533083740983928
2003	5.667867296673153
2004	5.05293965739864
2005	5.191930325775069
2006	4.863116018138914
2007	5.12508490101092