Year Percent Change From Preceding Period 2004-01-01 1.42489270386252 2005-01-01 3.35138794854435 2006-01-01 4.61840812315756 2007-01-01 7.15403882279287 2008-01-01 10.98612125639140 2009-01-01 7.12123206528904 2010-01-01 4.26394691570400 2011-01-01 4.98526812021215 2012-01-01 5.62415806017063 2013-01-01 5.76044212987569 2014-01-01 6.08984021706361 2015-01-01 4.57516339869282 2016-01-01 6.34057971014489 2017-01-01 5.27257240204467 2018-01-01 4.77908220263418 2019-01-01 5.26589113411155