Year Percent 2011-01-01 9.395560000000001 2012-01-01 9.395560000000001 2013-01-01 9.395560000000001 2014-01-01 8.672290000000000 2015-01-01 8.672290000000000 2016-01-01 8.672290000000000 2017-01-01 7.343489999999999