Year Percent Change From Preceding Period 2004-01-01 2.761126965730480 2005-01-01 4.266450171971800 2006-01-01 2.309315188875530 2007-01-01 3.262925305300230 2008-01-01 3.203737535787880 2009-01-01 3.368898721465440 2010-01-01 4.610803075552390 2011-01-01 8.085027316327800 2012-01-01 -1.712883104622290 2013-01-01 3.256075950325810 2014-01-01 0.964520000548284 2015-01-01 6.134019029244750 2016-01-01 6.263021729651600 2017-01-01 5.919013231017940 2018-01-01 4.500000000000070 2019-01-01 4.999999999999980