Year	% change from 1990
1991	0.711614494745261
1992	1.39703977381529
1993	2.70312130394132
1994	4.44766099327529
1995	5.56365950640367
1996	4.5600211766561
1997	4.1376144722169
1998	3.49780911722628
1999	3.31730065219595
2000	3.28322651137116
2001	5.56788357344806
2002	7.20428714644556
2003	8.74832445340572
2004	10.9577931220924
2005	11.627730155333
2006	13.1807788053212
2007	14.6496277188912
2008	16.4172589747344
2009	17.9505953118488
2010	19.4704146344211
2011	20.6651187807653
2012	21.8598229271095