Year	% change from 1990
1991	1.21179565072427
1992	2.83314192568445
1993	1.78564813099693
1994	6.17122957803875
1995	9.53024858296596
1996	12.9837365242841
1997	17.0790575334346
1998	28.6461304782722
1999	31.5633682806654
2000	27.7903530544956
2001	29.2222057570481
2002	30.4934612677361
2003	34.2974104397436
2004	39.5313599822176
2005	39.389286111214
2006	40.8687437483792
2007	43.1367391545956
2008	45.7766828437002
2009	48.5022042751825
2010	51.498536657652
2011	53.0135220242285
2012	54.528507390805