Year Percent Change From Preceding Period 2004-01-01 1.819558474304690 2005-01-01 2.821496152764290 2006-01-01 3.005987341692420 2007-01-01 3.975649919667650 2008-01-01 -2.464761448391810 2009-01-01 0.527192445076988 2010-01-01 6.149777042628660 2011-01-01 3.425227800478640 2012-01-01 1.480388947653400 2013-01-01 3.092288611087620 2014-01-01 2.416932573635010 2015-01-01 2.848304189239650 2016-01-01 2.954741094438040 2017-01-01 2.017936993875270 2018-01-01 3.089291733134560 2019-01-01 3.272474895314060