Year Percent 2007-01-01 0.29 2008-01-01 0.29 2009-01-01 1.36 2010-01-01 1.36 2011-01-01 1.36 2012-01-01 1.36 2013-01-01 1.36 2014-01-01 1.36 2015-01-01 1.36 2016-01-01 1.34