Year Percent Change From Preceding Period 2004-01-01 18.85268729731390 2005-01-01 6.56960896608768 2006-01-01 9.54466381793426 2007-01-01 15.32247944703600 2008-01-01 14.62288649647110 2009-01-01 2.37424150558442 2010-01-01 6.90990143436713 2011-01-01 6.43013466928510 2012-01-01 8.16198202530247 2013-01-01 5.78430196041574 2014-01-01 8.73825114234458 2015-01-01 10.17265013263040 2016-01-01 9.08457920471175 2017-01-01 9.27061617481908 2018-01-01 5.22840037678937 2019-01-01 9.23906704029766