Year Percent 2011-01-01 7.681089999999999 2012-01-01 7.681089999999999 2013-01-01 7.681089999999999 2014-01-01 14.306300000000000 2015-01-01 14.306300000000000 2016-01-01 14.306300000000000 2017-01-01 14.038000000000000