Year Percent Change from Year Ago 1996-01-01 1.388399456736830 1997-01-01 5.709702563832460 1998-01-01 6.044605047235490 1999-01-01 8.480954338089880 2000-01-01 8.239845471916910 2001-01-01 2.532023846700610 2002-01-01 3.819390527735130 2003-01-01 1.629270303169950 2004-01-01 3.612101941749170 2005-01-01 3.172431050664710 2006-01-01 5.178486401879930 2007-01-01 8.354532516685690 2008-01-01 -1.279590847938800 2009-01-01 -4.358635878635320 2010-01-01 4.865013368148960 2011-01-01 2.539225389222370 2012-01-01 -0.352529171980142 2013-01-01 3.654232963648200 2014-01-01 4.297348399304430 2015-01-01 3.915662229826580 2016-01-01 2.409564179462010 2017-01-01 1.546705981211890