Year	% change from 1990
1991	2.01956515314214
1992	4.11203168254406
1993	6.06559153555912
1994	8.04279507817194
1995	10.3687430423518
1996	13.6148245933778
1997	16.1811500684682
1998	18.9819421320697
1999	22.1974839173653
2000	25.9322017200784
2001	28.8610637690011
2002	32.6430689509098
2003	34.8734570029653
2004	37.5826297693755
2005	39.9282808082201
2006	42.8847271616736
2007	46.5248702059956
2008	49.9847301171348
2009	53.6327543913228
2010	57.5004679480233
2011	59.0754726275035
2012	60.6504773069838