Year Percent Change From Preceding Period 2004-01-01 6.78095592459718 2005-01-01 2.02066230682732 2006-01-01 3.45766879254917 2007-01-01 4.90220173244046 2008-01-01 3.48880091903694 2009-01-01 2.19866410215352 2010-01-01 3.42250764077059 2011-01-01 4.12927716073277 2012-01-01 4.54326501582801 2013-01-01 5.40426570955536 2014-01-01 5.88405932668045 2015-01-01 5.65146374362829 2016-01-01 4.64848155087740 2017-01-01 3.54908731822191 2018-01-01 3.76528259759782 2019-01-01 4.40126929460968