Year Percent Change from Year Ago 1996-01-01 2.6747835878668500 1997-01-01 3.6896139984344600 1998-01-01 4.3059784469708400 1999-01-01 4.4849011833659500 2000-01-01 5.2888505542150600 2001-01-01 4.0013088824264200 2002-01-01 2.8796513354101900 2003-01-01 3.1875749081718700 2004-01-01 3.1668541635794000 2005-01-01 3.7230017884165700 2006-01-01 4.1741231864199800 2007-01-01 3.7689924077177300 2008-01-01 1.1175966439623000 2009-01-01 -3.5737546371554200 2010-01-01 0.0142489419697891 2011-01-01 -0.9988565465485420 2012-01-01 -2.9277505071771100 2013-01-01 -1.7058012645262600 2014-01-01 1.3801944592434700 2015-01-01 3.6445800299657700 2016-01-01 3.1725896604464900 2017-01-01 2.9791824006186500