Year Percent Change From Preceding Period 2004-01-01 13.49286816079510 2005-01-01 34.78186496133990 2006-01-01 21.49587601153540 2007-01-01 20.50812553284470 2008-01-01 19.84691667973410 2009-01-01 17.71555702382180 2010-01-01 25.42692369100240 2011-01-01 18.23953206372850 2012-01-01 12.48554432558080 2013-01-01 9.96554221865500 2014-01-01 15.56726288337810 2015-01-01 18.80915113713360 2016-01-01 4.77895550520697 2017-01-01 6.10988784878788 2018-01-01 9.05189198278300 2019-01-01 13.38375717394770