Year Percent 2003-01-01 0.77 2004-01-01 0.67 2005-01-01 0.73 2006-01-01 0.71 2007-01-01 0.76 2008-01-01 0.75 2009-01-01 0.85 2010-01-01 0.90 2011-01-01 0.93 2012-01-01 0.95 2013-01-01 1.08