Year Percent Change From Preceding Period 2004-01-01 8.38080236109257 2005-01-01 7.82296259806489 2006-01-01 6.04055383184237 2007-01-01 4.26489237717771 2008-01-01 15.10140201772500 2009-01-01 10.55157476732010 2010-01-01 4.30913927412278 2011-01-01 14.02249130147060 2012-01-01 9.37777003547575 2013-01-01 5.71749357037744 2014-01-01 6.87815499275945 2015-01-01 6.58215429284775 2016-01-01 6.31750850254347 2017-01-01 7.98506903481088 2018-01-01 5.04146379844198 2019-01-01 5.58242428119809