Year Percent 2003-01-01 2.350 2009-01-01 7.175 2010-01-01 6.975 2011-01-01 5.625 2012-01-01 4.675 2013-01-01 4.375 2014-01-01 3.725 2015-01-01 2.600 2016-01-01 2.250 2017-01-01 1.745