Year Percent 2003-01-01 41.9067419294803 2004-01-01 41.7830922277804 2005-01-01 41.7737087333565 2006-01-01 41.7641374829754 2007-01-01 42.2303597740967 2008-01-01 42.5524503923375 2009-01-01 41.9242143932709 2010-01-01 41.8065172416139 2011-01-01 41.7018948392850 2012-01-01 41.5229936665285 2013-01-01 41.3628392608274