Quarter	Billions of US Dollars
1991-04-01	0.12500
1993-10-01	0.11000
1994-01-01	0.10000
1994-04-01	0.62500
1994-07-01	0.10000
1995-07-01	0.03460
1996-04-01	0.08600
1996-07-01	0.15000
1996-10-01	0.07500
1997-01-01	0.04800
1997-04-01	0.00486
1997-07-01	0.03000
1998-01-01	-0.00500
1998-04-01	-0.05986
1998-07-01	-0.00500
1998-10-01	-0.03427
1999-04-01	-0.15000
1999-07-01	-0.35000
1999-10-01	-0.07500
2000-01-01	-0.03800
2000-07-01	-0.03012
2000-10-01	-0.21000
2001-04-01	-0.22600
2002-04-01	0.15000
2003-07-01	0.15000
2004-01-01	0.12500
2005-01-01	0.20000
2006-04-01	-0.15000
2006-10-01	0.11000
2007-01-01	-0.15000
2007-04-01	0.17500
2009-04-01	-0.20000
2009-07-01	0.20000
2009-10-01	-0.12500
2010-01-01	0.38500
2010-07-01	-0.11657
2010-10-01	-0.15000
2011-04-01	0.11500
2011-10-01	2.84000
2012-01-01	0.10498
2012-04-01	0.37500
2012-07-01	-0.08343
2012-10-01	0.81502
2013-04-01	0.59000
2013-07-01	1.55000
2013-10-01	0.15000
2014-01-01	0.03000
2014-07-01	1.50000
2014-10-01	0.21431
2015-01-01	-0.15500
2015-04-01	6.60000