Year Percent Change From Preceding Period 2004-01-01 7.03239525382851 2005-01-01 7.23559896768369 2006-01-01 7.90369440506260 2007-01-01 8.35243627630666 2008-01-01 7.77389581713446 2009-01-01 9.22034843151732 2010-01-01 10.29824595474560 2011-01-01 5.56460233494508 2012-01-01 7.59759322547714 2013-01-01 5.05749097457939 2014-01-01 4.69772909562994 2015-01-01 2.91998023794810 2016-01-01 3.75703323288345 2017-01-01 3.39618204387203 2018-01-01 3.81644288892385 2019-01-01 4.47763922942645