Year Percent 2011-01-01 11.946800000000000 2012-01-01 11.946800000000000 2013-01-01 11.946800000000000 2014-01-01 15.564800000000000 2015-01-01 15.564800000000000 2016-01-01 15.564800000000000 2017-01-01 14.470999999999998