Year Percent 2011-01-01 5.8748700000000000 2012-01-01 5.8748700000000000 2013-01-01 5.8748700000000000 2014-01-01 5.8748700000000000 2015-01-01 5.8748700000000000 2016-01-01 5.8748700000000000 2017-01-01 4.9850900000000005