Year Percent Change From Preceding Period 2004-01-01 4.29946015402787 2005-01-01 1.45255851494875 2006-01-01 4.51369313477577 2007-01-01 5.72710548750393 2008-01-01 5.38716823548384 2009-01-01 3.31497052285687 2010-01-01 4.37714374805114 2011-01-01 4.07744874715262 2012-01-01 3.49611960862405 2013-01-01 3.36033946604819 2014-01-01 3.74480958993245 2015-01-01 3.55305824881753 2016-01-01 3.83795242599929 2017-01-01 3.80884802491927 2018-01-01 3.93070947100405 2019-01-01 4.01122318174941