Year Percent Change 2004-01-01 1.2517 2005-01-01 2.6582 2006-01-01 1.4650 2007-01-01 6.2114 2008-01-01 10.4006 2009-01-01 2.4479 2010-01-01 2.4577 2011-01-01 15.9016 2012-01-01 6.0721 2013-01-01 2.5939 2014-01-01 2.4329 2015-01-01 9.8385 2016-01-01 25.8810 2017-01-01 27.9884 2018-01-01 24.3353 2019-01-01 14.3951