Year % change from 1990 1991 -27.4454855495481 1992 -10.8002065165081 1993 -19.5652284323647 1994 -20.6573664027095 1995 -8.43878271262989 1996 -11.4135266534871 1997 -9.50892257981613 1998 275.384417314309 1999 198.983350758842 2000 241.677420094303 2001 210.374948152262 2002 140.01887786983 2003 264.435303419269 2004 136.222599686004 2005 211.523889651436 2006 307.204560352381 2007 375.598432248591 2008 312.69821441902 2009 192.884232302805 2010 249.761216097951 2011 251.024208567063 2012 252.285653074343