Year Percent 2006-01-01 7.500 2007-01-01 7.500 2008-01-01 8.325 2009-01-01 11.075 2010-01-01 9.175 2011-01-01 7.275 2012-01-01 6.750 2013-01-01 6.875 2014-01-01 7.825 2015-01-01 8.000 2016-01-01 8.400 2017-01-01 8.075