Year Percent Change from Year Ago 1998-01-01 7.129066071504010 1999-01-01 4.043050078454890 2000-01-01 4.891593667706040 2001-01-01 3.898810694917610 2002-01-01 0.681170993485068 2003-01-01 2.268136971670320 2004-01-01 8.042204807673240 2005-01-01 6.330001728206230 2006-01-01 5.248820337259060 2007-01-01 9.365322355353590 2008-01-01 1.991980821983210 2009-01-01 -6.777215053894990 2010-01-01 -3.435875598385290 2011-01-01 1.881620322656930 2012-01-01 1.296437590179400 2013-01-01 4.133851101827690 2014-01-01 2.080287198702790 2015-01-01 4.467860505098260 2016-01-01 7.351475306587750 2017-01-01 3.989144450440390