Year Percent 2011-01-01 7.7796199999999995 2012-01-01 7.7796199999999995 2013-01-01 7.7796199999999995 2014-01-01 13.7425000000000000 2015-01-01 13.7425000000000000 2016-01-01 13.7425000000000000 2017-01-01 17.2739000000000000