Year % change from 1990 1991 -9.64033475323429 1992 -33.9812912887997 1993 -33.2428568752031 1994 -35.1568254325322 1995 -38.6238186835089 1996 -38.5018254129537 1997 -35.8587749168557 1998 -45.5326254455413 1999 -42.8574065470141 2000 -40.9560792468697 2001 -41.5571966168418 2002 -57.8316437162587 2003 -53.8792553773314 2004 -48.6455923754268 2005 -45.9682462513611 2006 -48.5100012231187 2007 -47.0105711434075 2008 -46.1012579705568 2009 -71.2950964902537 2010 -81.2744954547958 2011 -81.2744954547954 2012 -81.2744954547948