Year % change from 1990 1991 -6.31899583713674 1992 11.1444674289142 1993 -7.68916448579388 1994 -0.394874200157569 1995 5.62334220989105 1996 1.33252198681493 1997 1.63036564114525 1998 4.13911084451064 1999 8.51157055772425 2000 9.56553329635459 2001 20.300641990202 2002 22.9550077742232 2003 17.6210822223257 2004 22.3792409992216 2005 25.1561136889384 2006 15.3325314375546 2007 18.5100389022973 2008 29.0969679177451 2009 23.1679323129483 2010 30.3893341599136 2011 31.6932275015127 2012 32.9971208431118