Year Percent 2005-01-01 10.125 2006-01-01 9.400 2007-01-01 8.475 2008-01-01 8.250 2009-01-01 9.725 2010-01-01 10.350 2011-01-01 10.475 2012-01-01 11.600 2013-01-01 12.200 2014-01-01 11.900 2015-01-01 11.150 2016-01-01 10.475 2017-01-01 9.550