Year Percent 2005-01-01 11.000 2006-01-01 10.275 2007-01-01 8.875 2008-01-01 7.750 2009-01-01 7.375 2010-01-01 6.575 2011-01-01 5.650 2012-01-01 5.225 2013-01-01 5.000 2014-01-01 4.700 2015-01-01 4.275 2016-01-01 3.800 2017-01-01 3.375