Quarter	Billions of US Dollars
1978-01-01	0.02460
1978-04-01	0.04420
1979-01-01	0.03000
1979-04-01	0.08000
1979-07-01	0.06620
1980-04-01	0.04600
1981-07-01	0.04300
1982-01-01	0.04200
1983-01-01	0.01680
1983-04-01	0.06000
1983-07-01	0.04050
1984-01-01	0.13400
1984-07-01	0.06190
1985-01-01	0.40000
1985-04-01	0.04010
1985-07-01	0.02110
1985-10-01	0.30000
1988-04-01	0.13870
1988-07-01	0.10970
1989-07-01	0.20000
1989-10-01	0.03210
1991-10-01	0.01720
1992-01-01	0.30000
1992-07-01	0.10000
1992-10-01	0.13830
1993-01-01	0.39790
1993-04-01	0.13500
1993-07-01	0.30300
1993-10-01	1.11370
1994-01-01	1.60570
1994-04-01	0.17880
1994-07-01	0.82320
1994-10-01	0.05000
1995-01-01	0.19000
1995-04-01	0.28860
1995-07-01	0.87640
1995-10-01	0.22507
1996-01-01	1.45640
1996-04-01	1.07609
1996-07-01	1.91418
1996-10-01	0.99915
1997-01-01	1.09930
1997-04-01	1.19208
1997-07-01	0.74063
1997-10-01	0.11135
1998-01-01	0.01062
1998-04-01	0.02946
1998-10-01	0.34140
1999-01-01	0.01370
1999-04-01	0.29168
1999-10-01	0.05740
2001-10-01	0.27863
2002-01-01	1.00000
2002-07-01	0.02428
2003-04-01	0.30000
2004-04-01	1.15000
2004-07-01	0.65130
2005-01-01	0.45000
2005-04-01	1.25255
2005-07-01	0.75000
2005-10-01	0.25000
2006-01-01	0.49000
2006-04-01	0.50000
2006-07-01	0.41000
2006-10-01	0.90350
2007-04-01	0.54120
2007-07-01	0.39480
2008-01-01	0.15000
2008-04-01	0.67868
2010-01-01	0.20000
2010-07-01	0.70000
2010-10-01	1.35000
2011-01-01	1.02783
2011-04-01	0.40000
2011-07-01	0.57893
2011-10-01	0.00004
2012-01-01	1.43902
2012-04-01	0.50020
2012-07-01	2.70000
2012-10-01	2.37786
2013-01-01	1.62500
2013-04-01	0.15685
2013-07-01	1.50000
2013-10-01	0.20000
2014-01-01	0.29040
2014-04-01	2.75031
2014-07-01	0.31155
2015-01-01	0.29982
2015-04-01	0.29673