Year Percent 2011-01-01 6.409280000000000 2012-01-01 6.409280000000000 2013-01-01 6.409280000000000 2014-01-01 10.568400000000000 2015-01-01 10.568400000000000 2016-01-01 10.568400000000000 2017-01-01 9.131219999999999