Quarter Billions of US Dollars 2001-07-01 1.50000 2001-10-01 1.50000 2002-01-01 1.50000 2002-04-01 1.50000 2002-07-01 1.50000 2002-10-01 1.50000 2003-01-01 1.50000 2003-04-01 1.50000 2003-07-01 1.50000 2003-10-01 1.50000 2004-01-01 1.50000 2004-04-01 1.50000 2004-07-01 1.50000 2004-10-01 1.50000 2005-01-01 1.50000 2005-04-01 1.50000 2005-07-01 2.75000 2005-10-01 2.75000 2006-01-01 2.75000 2006-04-01 2.75000 2006-07-01 2.25000 2006-10-01 2.25000 2007-01-01 2.25000 2007-04-01 2.25000 2007-07-01 3.32573 2007-10-01 3.34016 2008-01-01 3.35245 2008-04-01 3.37706 2008-07-01 3.35031 2008-10-01 3.34010 2009-01-01 3.31593 2009-04-01 3.32421 2009-07-01 3.34296 2009-10-01 3.34581 2010-01-01 3.34264 2010-04-01 4.80621 2010-07-01 4.80574 2010-10-01 4.78580 2011-01-01 4.75774 2011-04-01 4.75742 2011-07-01 3.75798 2011-10-01 3.74719 2012-01-01 3.74562 2012-04-01 3.74247 2012-07-01 2.75000 2012-10-01 2.75000 2013-01-01 2.75000 2013-04-01 5.45000 2013-07-01 6.45000 2013-10-01 6.45000 2014-01-01 6.45000 2014-04-01 6.45000 2014-07-01 6.45000 2014-10-01 3.75000 2015-01-01 3.75000 2015-04-01 5.38660