Year Number 2004-01-01 239.0026 2005-01-01 239.6301 2006-01-01 240.0264 2007-01-01 252.4439 2008-01-01 257.2655 2009-01-01 258.8177 2010-01-01 274.4386 2011-01-01 282.6288 2012-01-01 287.0872 2013-01-01 287.5495 2014-01-01 278.1704 2015-01-01 278.1704 2016-01-01 274.3395