Year % change from 1990 1991 0 1992 0 1993 0 1994 0 1995 0 1996 0 1997 0 1998 -100 1999 -100 2000 -100 2001 -100 2002 -100 2003 -100 2004 -100 2005 -100 2006 -99.9999999999999 2007 -99.9999999999999 2008 -100 2009 -99.9999999999999 2010 -100 2011 -99.9999999999999 2012 -100