Year % change from 1990 1991 -5.58025972102267 1992 -24.3009016794753 1993 -25.4868244018438 1994 -23.5707995043066 1995 -20.9647951637508 1996 -25.4591989141344 1997 -25.2181336463874 1998 -56.4697297171615 1999 -66.3602462917467 2000 -67.617797957247 2001 -68.6183996995668 2002 -79.0725748858727 2003 -79.199290366996 2004 -73.971232593024 2005 -73.793715813254 2006 -65.7695541670537 2007 -62.3243927498484 2008 -45.480804018772 2009 -78.1306937486778 2010 -67.9208890223974 2011 -67.9208890223979 2012 -67.9208890224018