Year Percent Change from Year Ago 1996-01-01 6.05652456690119 1997-01-01 6.45961007720333 1998-01-01 4.61455032519862 1999-01-01 4.64224358680576 2000-01-01 4.55957931233454 2001-01-01 1.24793653353087 2002-01-01 2.04161287808984 2003-01-01 3.56248529457060 2004-01-01 5.13562936825385 2005-01-01 3.49373942739537 2006-01-01 6.17966960465911 2007-01-01 7.03485516464984 2008-01-01 4.24969056695633 2009-01-01 2.82021678190553 2010-01-01 3.60700304979108 2011-01-01 5.01729124613625 2012-01-01 1.60787965523545 2013-01-01 1.39192456159869 2014-01-01 3.28310002847764 2015-01-01 3.84456920374410 2016-01-01 2.96964137628051 2017-01-01 4.64954342302038