Year Percent 2011-01-01 61.924900000000000 2012-01-01 61.924900000000000 2013-01-01 61.924900000000000 2014-01-01 61.427600000000000 2015-01-01 61.427600000000000 2016-01-01 61.427600000000000 2017-01-01 62.123999999999995