Year % change from 1990 1991 -0.387971852623659 1992 2.22263520691495 1993 1.83450960138922 1994 3.65809056828397 1995 5.9160356619657 1996 7.41881957138044 1997 11.9628937313069 1998 5.8696753562276 1999 9.3238941432886 2000 13.2943162256031 2001 16.1168465425928 2002 17.6825797824951 2003 22.1685272772187 2004 22.1333330857049 2005 24.9304256700852 2006 27.1726605662488 2007 24.6591857608615 2008 23.9810121559632 2009 15.7898646686204 2010 15.9108996004437 2011 15.4686155388903 2012 18.9392564172627