Year	% change from 1990
1991	1.49773541758416
1992	3.09890225326961
1993	4.43058176132394
1994	6.06205077028126
1995	7.38807387265816
1996	14.0234417612431
1997	16.2944886407253
1998	14.4201982166161
1999	19.6749990909348
2000	24.0078058398348
2001	26.3689511811787
2002	30.8997321287883
2003	32.9574517084365
2004	34.3339784329332
2005	36.7609804975213
2006	38.8465780765797
2007	39.9297797638047
2008	41.3899404865317
2009	43.3110982719681
2010	45.2811435636164
2011	46.7339549992525
2012	48.1867664348887