Year Percent 2003-01-01 34.200 2004-01-01 34.350 2005-01-01 34.200 2006-01-01 34.150 2007-01-01 34.900 2008-01-01 34.725 2009-01-01 36.175 2010-01-01 35.150 2011-01-01 34.500 2012-01-01 34.000 2013-01-01 33.925 2014-01-01 33.175 2015-01-01 33.875 2016-01-01 34.075 2017-01-01 33.400