Year Percent Change From Preceding Period 2004-01-01 15.24435614005180 2005-01-01 17.19539205121750 2006-01-01 24.56239668792530 2007-01-01 27.55859750083400 2008-01-01 24.83440596989260 2009-01-01 16.08732089314260 2010-01-01 12.89007211435430 2011-01-01 11.93923596134500 2012-01-01 10.40610613313490 2013-01-01 7.13444348534597 2014-01-01 6.42645526218369 2015-01-01 3.95879744719523 2016-01-01 5.12268803929903 2017-01-01 7.69013863898033 2018-01-01 6.00000000000012 2019-01-01 4.99999999999992