Year Percent 2011-01-01 8.400660000000000 2012-01-01 8.400660000000000 2013-01-01 8.400660000000000 2014-01-01 8.175260000000000 2015-01-01 8.175260000000000 2016-01-01 8.175260000000000 2017-01-01 7.686160000000001