Year Percent Change 2001-01-01 4.4083 2002-01-01 3.5363 2003-01-01 3.1032 2004-01-01 4.5661 2005-01-01 9.2776 2006-01-01 7.9221 2007-01-01 7.7701 2008-01-01 12.0006 2009-01-01 19.5607 2010-01-01 10.1040 2011-01-01 13.6607 2012-01-01 11.0048 2013-01-01 7.3605 2014-01-01 8.6206 2015-01-01 4.5258 2016-01-01 2.8630 2017-01-01 4.1480 2018-01-01 5.0158 2019-01-01 5.1854