Year % change from 1990 1991 25.6393665167465 1992 1.30928982833534 1993 20.1084685830731 1994 12.6084007572378 1995 11.932152058489 1996 26.7187242513033 1997 4.47265915457862 1998 256.372011141524 1999 -0.374147404129421 2000 29.4837901277738 2001 -44.3197621373076 2002 -20.3702084815453 2003 41.1603844870759 2004 -55.0975385753156 2005 60.8881567048097 2006 21.7320507719083 2007 -8.09498832390805 2008 -3.9254578997504 2009 17.8446255812923 2010 -38.5646144076142 2011 -38.5646144076142 2012 -38.5646144076142