Year	% change from 1990
1991	1.79503545821571
1992	3.03519193643758
1993	3.7490552960203
1994	3.99732154394981
1995	3.86731461285739
1996	3.31282722000541
1997	2.43567202227348
1998	1.62939409721543
1999	1.40149038066186
2000	2.09068375030839
2001	1.74217119406668
2002	2.16430213297516
2003	3.01130512078507
2004	3.83363811865876
2005	4.33486966021985
2006	7.21107721706851
2007	10.5810761597832
2008	13.951075102498
2009	17.1566074456379
2010	20.3617482016361
2011	21.5653656836524
2012	22.7689831656688