Year % change from 1990 1991 -5.52144299757812 1992 0.208095897094052 1993 9.94377563915576 1994 -22.3419687334461 1995 -14.4837673739226 1996 -11.5301103712149 1997 -10.7282715383196 1998 -56.3119424278856 1999 -66.0721483342914 2000 -49.6081003610305 2001 -65.5168516304142 2002 -78.6149756727048 2003 -46.5754135338985 2004 -27.945221089582 2005 -77.3865918795126 2006 -81.6795085931935 2007 -41.0406266100195 2008 -74.4386619219193 2009 -76.4680809622146 2010 -93.0840881286083 2011 -93.0840881286091 2012 -93.0840881286088