Quarter	Billions of US Dollars
1990-04-01	150
1993-07-01	322
1993-10-01	-31
1994-01-01	-344
1994-04-01	159
1994-07-01	-112
1994-10-01	-5
1995-01-01	-33
1995-04-01	26
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	-30
1997-10-01	3
1998-01-01	92
1998-04-01	-26
1998-07-01	365
1998-10-01	-70
1999-01-01	7
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	348
2003-10-01	962
2004-01-01	1053
2004-04-01	166
2004-07-01	1258
2004-10-01	205
2005-01-01	518
2005-04-01	933
2005-07-01	272
2005-10-01	-509
2006-01-01	590
2006-04-01	765
2006-07-01	159
2006-10-01	-308
2007-01-01	1806
2007-04-01	3089
2007-07-01	-2350
2007-10-01	-171
2008-01-01	818
2008-04-01	137
2008-07-01	1484
2008-10-01	-4068
2009-01-01	-730
2009-04-01	2841
2009-07-01	368
2009-10-01	-34
2010-01-01	1416
2010-04-01	-910
2010-07-01	-189
2010-10-01	1136
2011-01-01	659
2011-04-01	1467
2011-07-01	1574
2011-10-01	1521
2012-01-01	-5837
2012-04-01	-440
2012-07-01	-6023
2012-10-01	5266
2013-01-01	384
2013-04-01	312
2013-07-01	113
2013-10-01	-3676
2014-01-01	2702
2014-04-01	974
2014-07-01	-2368
2014-10-01	102
2015-01-01	-612
2015-04-01	1467
2015-07-01	80
2015-10-01	-38
2016-01-01	-256
2016-04-01	613
2016-07-01	2017
2016-10-01	504
2017-01-01	3265
2017-04-01	3103
2017-07-01	2250
2017-10-01	-1
2018-01-01	1342
2018-04-01	-882