Year Percent 2005-01-01 6.200 2006-01-01 6.100 2007-01-01 5.450 2008-01-01 5.000 2009-01-01 5.800 2010-01-01 6.075 2011-01-01 6.075 2012-01-01 6.600 2013-01-01 6.925 2014-01-01 6.725 2015-01-01 6.325 2016-01-01 5.925 2017-01-01 5.475