Year Percent 2000-01-01 8.000 2001-01-01 8.150 2002-01-01 8.825 2003-01-01 8.950 2004-01-01 8.225 2005-01-01 7.875 2006-01-01 7.875 2007-01-01 8.400 2008-01-01 8.650 2009-01-01 10.225 2010-01-01 11.100 2011-01-01 11.650 2012-01-01 11.350 2013-01-01 11.150 2014-01-01 10.550 2015-01-01 10.450 2016-01-01 10.750 2017-01-01 9.950