Year Percent 2009-01-01 17.4 2010-01-01 17.4 2011-01-01 17.4 2012-01-01 17.4 2013-01-01 17.4 2014-01-01 17.4 2015-01-01 17.4 2016-01-01 17.4 2017-01-01 9.0