Year Percent Change From Preceding Period 2004-01-01 6.52905790425215 2005-01-01 3.59559894089118 2006-01-01 3.13357123713262 2007-01-01 5.60241548593131 2008-01-01 2.25136564443789 2009-01-01 3.05145017568312 2010-01-01 4.38742661690160 2011-01-01 4.86226000246718 2012-01-01 4.59302034392677 2013-01-01 5.22644610031982 2014-01-01 5.36851592797402 2015-01-01 4.39329288210731 2016-01-01 5.29147085043578 2017-01-01 4.97955871984072 2018-01-01 4.47730551187814 2019-01-01 4.90675077329908