Year % change from 1990 1991 -2.91139632799252 1992 -2.35089940718376 1993 -0.300171336736454 1994 0.312567793120855 1995 -2.4049125385729 1996 1.00278477538065 1997 3.20227032244069 1998 2.07242186911998 1999 -0.354627198710766 2000 -1.67042249779742 2001 -12.1122233487256 2002 -12.0679502902099 2003 -12.7156651362946 2004 -14.2847023300911 2005 -16.0759902776364 2006 -17.4254331011949 2007 -18.2090662369228 2008 -18.5512969792492 2009 -21.7301025806766 2010 -19.6647644009191 2011 -23.5787130818209 2012 -25.4273235829652