Year % change from 1990 1991 -1.87967613430376 1992 -1.68950362218212 1993 -2.75442728816542 1994 -1.49000269252051 1995 -1.43721232962386 1996 0.737369004636657 1997 0.0968883367219675 1998 -0.732280776887562 1999 -1.5311325334922 2000 -0.798427737625529 2001 -5.34984745917226 2002 -7.47333450645251 2003 -9.6368913472567 2004 -12.9478435454771 2005 -14.8894264507279 2006 -17.5868231862058 2007 -18.5484982307808 2008 -20.7249876504472 2009 -21.041305808848 2010 -20.394888875226 2011 -22.9809925473602 2012 -25.2917170935246