Quarter	Billions of US Dollars
1973-10-01	0.00250
1980-04-01	0.03000
1981-04-01	0.02000
1981-10-01	0.13640
1982-04-01	0.03000
1984-04-01	0.02110
1984-07-01	0.02070
1984-10-01	0.04040
1985-01-01	0.15000
1985-07-01	0.02060
1985-10-01	0.17340
1986-01-01	0.29420
1986-04-01	0.03010
1986-10-01	0.04480
1987-01-01	0.15260
1987-10-01	0.12030
1988-01-01	0.10870
1988-04-01	0.12000
1988-07-01	0.34120
1988-10-01	0.12500
1989-01-01	0.15040
1989-04-01	0.10000
1989-07-01	0.14390
1989-10-01	0.20000
1990-01-01	0.12500
1990-04-01	0.14890
1990-10-01	0.23620
1991-01-01	0.15150
1993-07-01	0.06500
1993-10-01	0.41500
1994-01-01	0.38880
1994-04-01	0.19480
1994-07-01	0.20000
1995-07-01	0.65000
1995-10-01	0.15000
1996-01-01	0.20000
1996-04-01	0.32000
1996-07-01	0.35000
1996-10-01	0.22205
1997-01-01	0.63900
1997-04-01	0.31100
1997-07-01	1.15117
1997-10-01	0.08034
1999-01-01	0.10000
1999-07-01	0.10000
1999-10-01	0.02650
2000-01-01	0.10000
2001-01-01	0.09930
2002-04-01	0.10000
2002-10-01	0.15300
2003-07-01	0.10000
2003-10-01	0.35000
2004-01-01	0.88805
2004-04-01	0.97500
2004-07-01	0.53293
2004-10-01	0.87500
2005-01-01	0.75207
2005-04-01	0.63500
2005-07-01	1.43168
2005-10-01	0.83072
2006-01-01	3.24794
2006-04-01	1.34667
2006-07-01	0.92946
2006-10-01	1.36591
2007-01-01	4.91165
2007-04-01	3.10140
2007-07-01	3.56245
2007-10-01	1.05450
2008-01-01	0.71028
2008-04-01	0.02200
2008-10-01	1.00000
2009-07-01	1.19500
2009-10-01	2.82690
2010-01-01	1.00000
2010-04-01	0.33716
2010-07-01	0.07500
2010-10-01	0.20000
2011-01-01	1.76637
2011-04-01	0.85068
2011-07-01	1.70000
2011-10-01	0.02218
2012-01-01	0.34918
2012-04-01	0.12111
2012-07-01	1.23090
2012-10-01	2.73094
2013-01-01	2.05000
2013-04-01	1.76673
2013-07-01	1.00000
2014-01-01	1.22907
2014-04-01	2.11287
2014-07-01	3.51062
2014-10-01	1.98997
2015-01-01	3.28875
2015-04-01	2.50000