Year Percent 2004-01-01 22.0000 2005-01-01 22.0000 2006-01-01 19.0000 2007-01-01 14.2000 2008-01-01 13.7000 2009-01-01 16.6000 2010-01-01 14.7503 2011-01-01 15.5892 2012-01-01 13.6435 2013-01-01 12.1374 2014-01-01 13.7270 2015-01-01 15.2156 2016-01-01 18.0459