Year Percent 2004-01-01 17.0000 2005-01-01 15.8000 2006-01-01 13.3000 2007-01-01 11.4000 2008-01-01 11.5000 2009-01-01 11.4000 2010-01-01 10.5656 2011-01-01 11.0484 2012-01-01 11.1634 2013-01-01 11.2737 2014-01-01 10.8196 2015-01-01 10.8370 2016-01-01 10.6123