Year % change from 1990 1991 -15.4139796450291 1992 31.0248266145902 1993 -21.4683039008347 1994 -9.98401897845255 1995 -9.25307005060697 1996 -21.6808649337313 1997 -25.2840482935662 1998 545.856722236691 1999 515.795403867938 2000 451.653016234131 2001 -39.4279334577206 2002 -51.0136144261281 2003 -23.0636163230974 2004 -4.35509478625775 2005 -27.1236037455982 2006 7.21473542940403 2007 -0.708446223816894 2008 1103.43548142036 2009 8.27283413961122 2010 466.06939778518 2011 466.06939778518 2012 466.06939778518