Year Percent Change From Preceding Period 2004-01-01 8.86939571150110 2005-01-01 9.74658869395714 2006-01-01 8.67446393762168 2007-01-01 8.96686159844059 2008-01-01 9.44881889763776 2009-01-01 8.26771653543322 2010-01-01 8.85826771653537 2011-01-01 9.64566929133852 2012-01-01 6.98818897637796 2013-01-01 8.16929133858280 2014-01-01 8.56299212598396 2015-01-01 8.66141732283475 2016-01-01 6.29921259842529 2017-01-01 9.11493269839363 2018-01-01 5.80210646317653 2019-01-01 6.78528097142080