Year Percent 2006-01-01 19.6000 2007-01-01 15.4000 2008-01-01 12.0000 2009-01-01 21.6000 2010-01-01 21.5003 2011-01-01 24.2466 2012-01-01 26.3324 2013-01-01 26.0550 2014-01-01 21.5927 2015-01-01 25.4578 2016-01-01 26.6149