Year Percent 2001-01-01 14.500 2002-01-01 14.500 2003-01-01 14.575 2004-01-01 14.750 2005-01-01 14.125 2006-01-01 13.750 2007-01-01 12.925 2008-01-01 12.425 2009-01-01 12.850 2010-01-01 13.375 2011-01-01 12.675 2012-01-01 12.425 2013-01-01 11.875 2014-01-01 12.025 2015-01-01 11.625 2016-01-01 11.550 2017-01-01 11.250