Year Number 2004-01-01 86.68982976 2005-01-01 86.23813427 2006-01-01 81.74111604 2007-01-01 79.94255925 2008-01-01 79.98236525 2009-01-01 79.36998885 2010-01-01 76.06780113 2011-01-01 76.70099815 2012-01-01 75.56440540 2013-01-01 68.62800876 2014-01-01 66.83665774