Year Percent 2011-01-01 1.1644000000000000 2012-01-01 1.1644000000000000 2013-01-01 1.1644000000000000 2014-01-01 1.9819799999999999 2015-01-01 1.9819799999999999 2016-01-01 1.9819799999999999 2017-01-01 1.9035300000000000