Quarter	Billions of US Dollars
1997-07-01	0.20000
1997-10-01	0.20000
1998-01-01	0.20000
1998-04-01	0.20000
1998-07-01	0.20000
1998-10-01	0.20000
1999-01-01	0.20000
1999-04-01	0.20000
1999-07-01	0.20000
1999-10-01	0.20000
2000-01-01	0.20000
2000-04-01	0.20000
2000-07-01	0.20000
2000-10-01	0.20000
2001-01-01	0.20000
2001-04-01	0.20000
2001-07-01	0.20000
2001-10-01	0.20000
2002-01-01	0.20000
2002-04-01	0.20000
2002-07-01	0.20000
2002-10-01	0.20000
2003-01-01	0.20000
2003-04-01	0.20000
2003-07-01	0.20000
2003-10-01	0.20000
2004-01-01	0.20000
2004-04-01	0.20000
2006-10-01	0.25000
2007-01-01	0.68127
2007-04-01	0.67666
2007-07-01	0.67488
2007-10-01	0.67326
2008-01-01	0.67230
2008-04-01	0.66870
2008-07-01	0.66531
2008-10-01	0.66520
2009-01-01	0.61387
2009-04-01	0.61341
2009-07-01	0.61330
2009-10-01	0.61256
2010-01-01	0.60967
2010-04-01	0.60852
2010-07-01	0.60750
2010-10-01	0.60614
2011-01-01	0.64510
2011-04-01	0.64514
2011-07-01	0.64472
2011-10-01	0.64277
2012-01-01	0.49500
2012-04-01	0.29000
2012-07-01	0.29000
2012-10-01	0.29000
2013-01-01	0.29000
2013-04-01	0.29005
2013-07-01	0.29005
2013-10-01	0.04005
2014-01-01	0.04000
2014-04-01	0.04000
2014-07-01	0.04000
2014-10-01	0.04000
2015-01-01	0.04000
2015-04-01	0.04000