Year Number 2004-01-01 0.8338 2005-01-01 0.9127 2006-01-01 0.9362 2007-01-01 1.0749 2008-01-01 1.1919 2009-01-01 1.3136 2010-01-01 1.3609 2011-01-01 1.8948 2012-01-01 2.9258