Year	% change from 1990
1991	2.96834919465281
1992	5.80531244134557
1993	7.7900049356626
1994	11.5737812041627
1995	14.2710165379455
1996	16.7464946368117
1997	19.5452238774843
1998	21.7395082411662
1999	24.4676783616381
2000	28.4388012596367
2001	30.7401408401749
2002	33.9521449277377
2003	37.4342201305518
2004	40.2892576346358
2005	43.2117260220645
2006	45.7233526357133
2007	48.5721336660851
2008	51.427866333915
2009	54.5828669943205
2010	57.4104455304447
2011	58.9845499857491
2012	60.5586544410536