Year Percent 2005-01-01 10.900 2006-01-01 10.175 2007-01-01 8.825 2008-01-01 7.675 2009-01-01 7.325 2010-01-01 6.525 2011-01-01 5.600 2012-01-01 5.175 2013-01-01 4.925 2014-01-01 4.625 2015-01-01 4.250 2016-01-01 3.750 2017-01-01 3.325