Year	% change from 1990
1991	0.136074466579128
1992	0.282318525223468
1993	0.480724773616181
1994	0.715759867866028
1995	1.1400439990443
1996	1.6425035836491
1997	2.15395080172811
1998	-97.9814790989107
1999	-96.6021132436052
2000	-96.605023201915
2001	-96.0336869729696
2002	-92.7556452216136
2003	-92.9813263939307
2004	-91.1291494610718
2005	-88.8234282235805
2006	-87.3911235113321
2007	-85.8880588215853
2008	-84.209745453771
2009	-81.839885072248
2010	-77.987081107813
2011	-77.9870811078137
2012	-77.9870811078129