Year Percent 2001-01-01 14.1000 2002-01-01 14.9000 2003-01-01 15.6000 2004-01-01 14.5000 2005-01-01 13.7000 2006-01-01 13.6000 2007-01-01 13.8000 2008-01-01 13.5000 2009-01-01 15.9000 2010-01-01 15.7192 2011-01-01 15.3398 2012-01-01 14.6616 2013-01-01 14.7774 2014-01-01 14.5583 2015-01-01 14.1098 2016-01-01 13.8993