Year % change from 1990 1991 -4.14947175807794 1992 25.6597358904726 1993 10.0790394655044 1994 3.6051938135679 1995 15.7779575226439 1996 -1.16281226087935 1997 1.44624036861345 1998 -3.14475476205022 1999 -48.3860295771048 2000 -47.4627585660933 2001 -46.2880993690019 2002 -46.4205619342842 2003 -41.4048525887018 2004 -43.8110595796518 2005 -40.2782655244737 2006 -28.1571363593846 2007 -29.2296502368897 2008 -25.2015509092669 2009 -26.2265670742657 2010 -23.1024562152412 2011 -21.0830844738793 2012 -19.2619944768227