Year % change from 1990 1991 6.45921568824941 1992 1.4805936475482 1993 -1.09080470768348 1994 4.76484244771338 1995 1.45868690480386 1996 4.98214726367157 1997 -0.509142917575256 1998 0.84328369483655 1999 -18.0496452114882 2000 -13.2059888502233 2001 -9.37759670442013 2002 5.24981240777764 2003 20.4251418902246 2004 23.3518323605397 2005 31.4694136546994 2006 30.4586818687711 2007 33.7623193952732 2008 36.3709843933343 2009 42.3583238068379 2010 44.2735270863025 2011 45.7162623571655 2012 47.1589976280286