Year Number 2004-01-01 79.4118 2005-01-01 73.5294 2006-01-01 73.5294 2007-01-01 73.5294 2008-01-01 73.5294 2009-01-01 73.5294 2010-01-01 73.5294 2011-01-01 76.4706 2012-01-01 79.4118 2013-01-01 79.4118 2014-01-01 79.4118 2015-01-01 79.4118 2016-01-01 58.8235 2017-01-01 58.8235