Year Percent 2011-01-01 3.6765700000000000 2012-01-01 3.6765700000000000 2013-01-01 3.6765700000000000 2014-01-01 2.7406900000000003 2015-01-01 2.7406900000000003 2016-01-01 2.7406900000000003 2017-01-01 6.2524300000000000