Year Percent Change From Preceding Period 2004-01-01 13.95580180332040 2005-01-01 18.36382464689340 2006-01-01 10.76563715548690 2007-01-01 10.28796631876670 2008-01-01 9.29650839381097 2009-01-01 8.95421802392917 2010-01-01 9.24732173644121 2011-01-01 9.48254048583009 2012-01-01 5.71384434191061 2013-01-01 5.82642944451989 2014-01-01 6.08040811088285 2015-01-01 7.40412641247608 2016-01-01 6.66016985795117 2017-01-01 8.28073436730436 2018-01-01 7.78370516471065 2019-01-01 7.17276358633310