Year % change from 1990 1991 -7.68989298140553 1992 -18.4008153483645 1993 -35.062250141417 1994 -49.1603872739955 1995 -61.5191438512557 1996 -61.42759750624 1997 -62.617699991457 1998 246.130322264196 1999 161.396856243588 2000 -30.7181838230443 2001 -46.1790798475461 2002 -42.9866757041199 2003 -37.7974352192866 2004 -26.6046586653303 2005 -7.78243718158114 2006 -14.7180981356652 2007 -4.88069268358507 2008 8.92165820824227 2009 6.10093222558605 2010 6.06504605833764 2011 6.06504605834315 2012 6.06504605833949