Year Percent 2005-01-01 12.525 2006-01-01 11.925 2007-01-01 9.675 2008-01-01 8.125 2009-01-01 7.975 2010-01-01 7.925 2011-01-01 6.500 2012-01-01 6.175 2013-01-01 6.100 2014-01-01 5.525 2015-01-01 5.250 2016-01-01 4.125 2017-01-01 3.650