Year Percent 2000-01-01 3.450 2001-01-01 3.575 2002-01-01 3.975 2003-01-01 4.400 2004-01-01 4.625 2005-01-01 4.625 2006-01-01 3.500 2007-01-01 2.600 2008-01-01 2.750 2009-01-01 3.625 2010-01-01 4.175 2011-01-01 3.525 2012-01-01 3.675 2013-01-01 3.675 2014-01-01 3.825 2015-01-01 4.725 2016-01-01 5.550 2017-01-01 4.725