Year Number 2004-01-01 654.9594 2005-01-01 640.6213 2006-01-01 627.0397 2007-01-01 615.5886 2008-01-01 610.4203 2009-01-01 624.4692 2010-01-01 637.9772 2011-01-01 794.9874 2012-01-01 874.1953