Year Number 2005-01-01 0.6366 2006-01-01 1.2773 2007-01-01 1.9481 2008-01-01 2.6698 2009-01-01 3.5605 2010-01-01 4.4801 2011-01-01 6.6174 2012-01-01 8.3100 2013-01-01 10.3477