Year Percent Change from Year Ago 1996-01-01 0.0141547818735806 1997-01-01 3.3401635873430200 1998-01-01 4.2358477373727900 1999-01-01 3.1869022430822600 2000-01-01 4.2091796914572300 2001-01-01 3.8405102344051100 2002-01-01 4.5282056769948500 2003-01-01 3.8486144216083500 2004-01-01 5.0049131654370500 2005-01-01 4.3882246315032400 2006-01-01 3.8511683638756700 2007-01-01 0.4223964624584490 2008-01-01 0.8513213085091090 2009-01-01 -6.6009936463980700 2010-01-01 0.6552933697210750 2011-01-01 1.6576574217996500 2012-01-01 -1.6314033368122300 2013-01-01 2.0936421639662400 2014-01-01 4.2246537548408700 2015-01-01 3.5364254760518600 2016-01-01 2.2807977502252900 2017-01-01 4.1370639367247900