Quarter	Billions of US Dollars
1972-07-01	0.0313
1972-10-01	0.0600
1973-04-01	0.0250
1973-10-01	0.0360
1974-10-01	0.0250
1975-01-01	0.0350
1976-04-01	0.0500
1976-07-01	0.0401
1976-10-01	0.1913
1977-01-01	0.0834
1977-04-01	0.1986
1977-07-01	0.2397
1977-10-01	0.4635
1978-01-01	0.2416
1978-04-01	0.1775
1978-07-01	0.2459
1978-10-01	0.1767
1979-01-01	0.2035
1979-04-01	0.0500
1979-07-01	0.2433
1979-10-01	0.1973
1980-01-01	-0.0350
1980-04-01	0.2600
1980-07-01	0.0551
1981-04-01	-0.0036
1981-07-01	0.0601
1981-10-01	-0.0400
1982-01-01	-0.0006
1982-04-01	-0.0850
1982-07-01	-0.0500
1982-10-01	0.0181
1983-04-01	-0.0269
1983-10-01	-0.0750
1984-04-01	-0.1054
1984-07-01	-0.0514
1984-10-01	-0.1405
1985-01-01	0.1000
1985-04-01	0.0604
1985-07-01	0.0750
1985-10-01	-0.4965
1986-01-01	0.0945
1986-04-01	-0.0335
1986-10-01	-0.1281
1987-01-01	-0.1359
1987-04-01	-0.0255
1987-07-01	-0.2636
1987-10-01	-0.2806
1988-04-01	-0.4439
1988-07-01	-0.3094
1988-10-01	-0.0929
1989-01-01	-0.2102
1989-04-01	-0.0500
1989-07-01	0.8801
1989-10-01	-0.1870
1990-01-01	-0.0824
1990-04-01	-0.0208
1990-07-01	-0.0055
1991-04-01	-0.0723
1991-07-01	0.4973
1991-10-01	0.8548
1992-01-01	0.4916
1992-04-01	1.7700
1992-07-01	0.1650
1992-10-01	-0.0057
1993-01-01	0.1700
1993-04-01	1.3488
1993-07-01	1.0227
1993-10-01	1.8060
1994-01-01	0.7737
1994-04-01	42.6705
1994-07-01	0.1353
1994-10-01	0.8607
1995-01-01	-0.0327
1995-04-01	0.9313
1995-07-01	1.0977
1995-10-01	0.6631
1996-01-01	1.3066
1996-04-01	4.0562
1996-07-01	-0.1012
1996-10-01	3.4792
1997-01-01	0.9317
1997-04-01	5.6628
1997-07-01	3.2551
1997-10-01	-0.3685
1998-01-01	1.9198
1998-04-01	3.3086
1998-07-01	0.2071
1998-10-01	-9.6464
1999-01-01	-1.0289
1999-04-01	2.0352
1999-07-01	1.4813
1999-10-01	4.4774
2000-01-01	4.6126
2000-04-01	-3.9042
2000-07-01	7.3041
2000-10-01	0.4623
2001-01-01	2.4392
2001-04-01	-4.0907
2001-07-01	-0.1496
2001-10-01	-0.5226
2002-01-01	3.3581
2002-04-01	1.7149
2002-07-01	1.3571
2002-10-01	-1.7983
2003-01-01	-0.4648
2003-04-01	3.9531
2003-07-01	2.7084
2003-10-01	4.3655
2004-01-01	3.2727
2004-04-01	-2.6475
2004-07-01	1.9302
2004-10-01	-1.1848
2005-01-01	2.3011
2005-04-01	-0.0851
2005-07-01	1.0615
2005-10-01	2.0958
2006-01-01	2.9165
2006-04-01	-11.2160
2006-07-01	2.9782
2006-10-01	6.2539
2007-01-01	1.6856
2007-04-01	4.1742
2007-07-01	-2.6940
2007-10-01	0.4521
2008-01-01	2.2757
2008-04-01	1.2053
2008-07-01	-2.7258
2008-10-01	-1.1744
2009-01-01	0.1706
2009-04-01	2.2507
2009-07-01	7.5825
2009-10-01	11.6459
2010-01-01	7.9343
2010-04-01	6.6078
2010-07-01	12.4326
2010-10-01	6.0787
2011-01-01	10.3838
2011-04-01	12.7356
2011-07-01	1.2907
2011-10-01	8.5526
2012-01-01	22.7682
2012-04-01	5.5710
2012-07-01	8.1590
2012-10-01	13.0769
2013-01-01	5.6685
2013-04-01	18.0417
2013-07-01	4.5717
2013-10-01	5.5295
2014-01-01	15.9308
2014-04-01	13.4308
2014-07-01	12.4794
2014-10-01	-5.0195
2015-01-01	-12.2113
2015-04-01	3.0284