Year % change from 1990 1991 -6.17354993876619 1992 2.47443672258862 1993 3.11997403095625 1994 6.33954524663214 1995 13.816711669839 1996 16.626090035855 1997 22.3532970356927 1998 24.0007082466469 1999 26.8646806250277 2000 32.6051672494946 2001 36.6244669706225 2002 33.3134138963894 2003 40.5581868885839 2004 48.4425951337553 2005 55.1783158484942 2006 57.7619405958125 2007 81.530255411447 2008 73.1995042273472 2009 79.0240951411329 2010 71.8744927921148 2011 73.593237720036 2012 75.3119826479571