Year Percent 2005-01-01 10.375 2006-01-01 9.500 2007-01-01 7.975 2008-01-01 7.025 2009-01-01 7.300 2010-01-01 6.525 2011-01-01 5.400 2012-01-01 5.000 2013-01-01 4.850 2014-01-01 4.675 2015-01-01 4.375 2016-01-01 3.925 2017-01-01 3.525