Quarter Billions of US Dollars 1997-07-01 0.11500 1997-10-01 0.11500 1998-01-01 0.11500 1998-04-01 0.11500 1998-07-01 0.11500 1998-10-01 0.11500 1999-01-01 0.11500 1999-04-01 0.11500 1999-07-01 0.11500 1999-10-01 0.11500 2000-01-01 0.11500 2000-04-01 0.11500 2000-07-01 0.11500 2000-10-01 0.11500 2001-01-01 0.11500 2001-04-01 0.11500 2001-07-01 0.11500 2001-10-01 0.11500 2002-01-01 0.11500 2002-04-01 0.11500 2005-10-01 0.15000 2006-01-01 0.15000 2006-04-01 0.15000 2006-07-01 0.15000 2006-10-01 0.15000 2007-01-01 0.15000 2007-04-01 0.15000 2007-07-01 0.15000 2007-10-01 0.15000 2008-01-01 0.15000 2008-04-01 0.18500 2008-07-01 0.18500 2008-10-01 0.18500 2009-01-01 0.18500 2009-04-01 0.18500 2009-07-01 0.18500 2009-10-01 0.18500 2010-01-01 0.18500 2010-04-01 0.18500 2010-07-01 0.18500 2010-10-01 0.03500 2011-01-01 0.03500 2011-04-01 0.03500 2011-07-01 0.18500 2011-10-01 0.18500 2012-01-01 0.18500 2012-04-01 0.18500 2012-07-01 0.18500 2012-10-01 1.08500 2013-01-01 1.08500 2013-04-01 1.08500 2013-07-01 1.18500 2013-10-01 1.18500 2014-01-01 1.18500 2014-04-01 1.55566 2014-07-01 1.52943 2014-10-01 1.91864 2015-01-01 2.04923 2015-04-01 2.21461