Year	% change from 1990
1991	2.85407738503529
1992	7.53047263554256
1993	8.7690345196145
1994	11.2090976659998
1995	12.0549398123217
1996	12.9163433246859
1997	14.3764499200433
1998	15.8707505697303
1999	17.2634928305101
2000	18.5468960193616
2001	19.2872894352657
2002	19.5446662394116
2003	20.3352245853203
2004	20.2320281578823
2005	20.2850596553158
2006	22.1565186767106
2007	24.8730008251619
2008	26.4926114224522
2009	29.2563919334792
2010	32.5699391263931
2011	33.895638517657
2012	35.221337908921