Year Percent 2006-01-01 21.9 2007-01-01 21.9 2008-01-01 21.9 2009-01-01 21.9 2010-01-01 21.9 2011-01-01 21.9 2012-01-01 21.9 2013-01-01 21.9 2014-01-01 21.9 2015-01-01 21.9 2016-01-01 26.7