Year Percent Change From Preceding Period 2004-01-01 3.83222708403984 2005-01-01 7.09377044823156 2006-01-01 9.11564654457069 2007-01-01 3.25360491375184 2008-01-01 8.18617181743472 2009-01-01 2.42628134548603 2010-01-01 6.67198532008353 2011-01-01 4.39820168502807 2012-01-01 3.14197585150284 2013-01-01 4.81479438630852 2014-01-01 6.54993309994861 2015-01-01 3.81998853538165 2016-01-01 4.17920926911011 2017-01-01 3.87496022204643 2018-01-01 3.99999999999986 2019-01-01 4.50000000000010