Quarter	Billions of US Dollars
1990-04-01	150
1993-07-01	202
1993-10-01	-32
1994-01-01	77
1994-04-01	5
1994-07-01	15
1994-10-01	1
1995-01-01	-30
1995-04-01	27
1995-07-01	26
1995-10-01	-36
1996-01-01	-11
1996-04-01	-18
1996-07-01	12
1996-10-01	99
1997-01-01	16
1997-04-01	334
1997-07-01	-35
1997-10-01	-51
1998-01-01	92
1998-04-01	3
1998-07-01	376
1998-10-01	-56
1999-01-01	12
1999-04-01	266
1999-07-01	35
1999-10-01	19
2000-01-01	-15
2000-04-01	-22
2000-07-01	25
2000-10-01	-66
2001-01-01	71
2001-04-01	244
2001-07-01	36
2001-10-01	141
2002-01-01	496
2002-04-01	-458
2002-07-01	70
2002-10-01	-169
2003-01-01	-33
2003-04-01	0
2003-07-01	116
2003-10-01	696
2004-01-01	38
2004-04-01	244
2004-07-01	768
2004-10-01	222
2005-01-01	-102
2005-04-01	195
2005-07-01	264
2005-10-01	7
2006-01-01	15
2006-04-01	641
2006-07-01	81
2006-10-01	-597
2007-01-01	562
2007-04-01	2213
2007-07-01	-388
2007-10-01	-517
2008-01-01	-76
2008-04-01	-28
2008-07-01	699
2008-10-01	741
2009-01-01	-271
2009-04-01	4521
2009-07-01	576
2009-10-01	428
2010-01-01	1501
2010-04-01	-585
2010-07-01	1102
2010-10-01	-221
2011-01-01	-959
2011-04-01	1917
2011-07-01	2848
2011-10-01	173
2012-01-01	-7588
2012-04-01	-479
2012-07-01	-5663
2012-10-01	5245
2013-01-01	41
2013-04-01	128
2013-07-01	-193
2013-10-01	-3890
2014-01-01	4253
2014-04-01	1294
2014-07-01	-1860
2014-10-01	-16
2015-01-01	58
2015-04-01	1067
2015-07-01	50
2015-10-01	-410
2016-01-01	-35
2016-04-01	-890
2016-07-01	1442
2016-10-01	27
2017-01-01	-21
2017-04-01	431
2017-07-01	497
2017-10-01	-4
2018-01-01	1729
2018-04-01	-1249