Year Percent 2006-01-01 39.4 2007-01-01 39.4 2008-01-01 39.4 2009-01-01 39.4 2010-01-01 49.3 2011-01-01 49.3 2012-01-01 49.3 2013-01-01 49.3 2014-01-01 49.3 2015-01-01 49.3 2016-01-01 49.3 2017-01-01 42.4