Quarter	Billions of US Dollars
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	0
1992-04-01	0
1992-07-01	0
1992-10-01	0
1993-01-01	0
1993-04-01	0
1993-07-01	652
1993-10-01	619
1994-01-01	276
1994-04-01	438
1994-07-01	329
1994-10-01	322
1995-01-01	292
1995-04-01	318
1995-07-01	344
1995-10-01	308
1996-01-01	295
1996-04-01	273
1996-07-01	46
1996-10-01	296
1997-01-01	304
1997-04-01	335
1997-07-01	303
1997-10-01	306
1998-01-01	294
1998-04-01	271
1998-07-01	259
1998-10-01	189
1999-01-01	217
1999-04-01	193
1999-07-01	192
1999-10-01	198
2000-01-01	191
2000-04-01	151
2000-07-01	162
2000-10-01	94
2001-01-01	166
2001-04-01	619
2001-07-01	585
2001-10-01	551
2002-01-01	572
2002-04-01	130
2002-07-01	197
2002-10-01	109
2003-01-01	75
2003-04-01	78
2003-07-01	437
2003-10-01	784
2004-01-01	1797
2004-04-01	1960
2004-07-01	2265
2004-10-01	2651
2005-01-01	3113
2005-04-01	3897
2005-07-01	4250
2005-10-01	4297
2006-01-01	4947
2006-04-01	4703
2006-07-01	5110
2006-10-01	4446
2007-01-01	6342
2007-04-01	6907
2007-07-01	5607
2007-10-01	5691
2008-01-01	6939
2008-04-01	6097
2008-07-01	6081
2008-10-01	2431
2009-01-01	1603
2009-04-01	3125
2009-07-01	3047
2009-10-01	2928
2010-01-01	2186
2010-04-01	1525
2010-07-01	1385
2010-10-01	1101
2011-01-01	2089
2011-04-01	2527
2011-07-01	3752
2011-10-01	3823
2012-01-01	2642
2012-04-01	3798
2012-07-01	930
2012-10-01	2977
2013-01-01	3206
2013-04-01	1218
2013-07-01	2155
2013-10-01	1927
2014-01-01	2258
2014-04-01	2397
2014-07-01	922
2014-10-01	2108
2015-01-01	1516
2015-04-01	2305
2015-07-01	2380
2015-10-01	1317
2016-01-01	1146
2016-04-01	242
2016-07-01	240
2016-10-01	275
2017-01-01	844
2017-04-01	1984
2017-07-01	1913
2017-10-01	1809
2018-01-01	1451
2018-04-01	511