Year Percent 2006-01-01 40.7 2007-01-01 40.7 2008-01-01 40.7 2009-01-01 17.6 2010-01-01 17.6 2011-01-01 17.6 2012-01-01 17.6 2013-01-01 17.6 2014-01-01 17.6 2015-01-01 17.6 2016-01-01 17.6 2017-01-01 17.4