Year Percent 2011-01-01 13.721700000000000 2012-01-01 13.721700000000000 2013-01-01 13.721700000000000 2014-01-01 12.264900000000000 2015-01-01 12.264900000000000 2016-01-01 12.264900000000000 2017-01-01 9.557939999999999