Year % change from 1990 1991 -1.02626205869437 1992 0.282632216584755 1993 -0.348395539953839 1994 0.799747404910467 1995 2.73528681529642 1996 5.89225708722994 1997 9.83653298993659 1998 17.8006958262452 1999 13.6549120346415 2000 19.2081492177382 2001 17.960922942912 2002 19.1450000315283 2003 22.8351083069107 2004 22.2006100008572 2005 24.1851806221817 2006 21.3681504993565 2007 31.7954865568736 2008 21.3654279398551 2009 17.2842121019974 2010 11.2218516248286 2011 8.64367023278614 2012 4.04734628338168