Year	% change from 1990
1991	-7.83240445859873
1992	-11.9579862812347
1993	-4.86817123958844
1994	1.91082802547771
1995	4.55505879470848
1996	6.96656050955413
1997	9.50208231259186
1998	11.0599889759922
1999	13.3352217050466
2000	14.6749448799608
2001	16.6623285154336
2002	18.4789931406174
2003	19.9503919647232
2004	20.6424546790789
2005	20.4028356197942
2006	20.764943655071
2007	20.93795933366
2008	21.3513596276335
2009	21.0290605095541
2010	21.6323187163155
2011	22.8486419034787
2012	24.0649650906418