Quarter	Billions of US Dollars
1987-01-01	0.5726
1987-04-01	0.6861
1987-07-01	0.6950
1987-10-01	0.6785
1988-01-01	0.6171
1988-04-01	0.5467
1988-07-01	0.6710
1988-10-01	0.7013
1989-01-01	0.7129
1989-04-01	0.7158
1989-07-01	0.6258
1989-10-01	0.4898
1990-01-01	0.5137
1990-04-01	0.4969
1990-07-01	0.6958
1990-10-01	0.8365
1991-01-01	0.8305
1991-04-01	0.7818
1991-07-01	0.7823
1991-10-01	0.8244
1992-01-01	0.7879
1992-04-01	0.6640
1992-07-01	0.6450
1992-10-01	0.4030
1993-01-01	0.3700
1993-04-01	0.4020
1993-07-01	0.3979
1993-10-01	0.4921
1994-01-01	0.2557
1994-04-01	0.9984
1994-07-01	1.3262
1994-10-01	1.2293
1995-01-01	1.5524
1995-04-01	1.5106
1995-07-01	1.4670
1995-10-01	1.3281
1996-01-01	1.3580
1996-04-01	0.9634
1996-07-01	0.9534
1996-10-01	0.9797
1997-01-01	0.9049
1997-04-01	1.1193
1997-07-01	1.0271
1997-10-01	0.9671
1998-01-01	1.0110
1998-04-01	0.7519
1998-07-01	0.7396
1998-10-01	0.7093
1999-01-01	0.8118
1999-04-01	0.5174
1999-07-01	0.6027
1999-10-01	0.4679
2000-01-01	0.6522
2000-04-01	0.5275
2000-07-01	0.4512
2000-10-01	0.4095
2001-01-01	0.2635
2001-04-01	0.2278
2001-07-01	0.2349
2001-10-01	0.2953
2002-01-01	0.2836
2002-04-01	1.3799
2002-07-01	1.0200
2002-10-01	1.0369
2003-01-01	2.2316
2003-04-01	2.3139
2003-07-01	1.7370
2003-10-01	2.1777
2004-01-01	3.3705
2004-04-01	3.9293
2004-07-01	5.8110
2004-10-01	8.5177
2005-01-01	10.7041
2005-04-01	11.3154
2005-07-01	11.3501
2005-10-01	12.1337
2006-01-01	12.2974
2006-04-01	12.3870
2006-07-01	12.2731
2006-10-01	11.1595
2007-01-01	9.7368
2007-04-01	9.7543
2007-07-01	10.7986
2007-10-01	11.5435
2008-01-01	13.6278
2008-04-01	10.2206
2008-07-01	8.3152
2008-10-01	7.1670
2009-01-01	5.8303
2009-04-01	5.7859
2009-07-01	3.6014
2009-10-01	5.2450
2010-01-01	3.8073
2010-04-01	3.0329
2010-07-01	2.6883
2010-10-01	2.8185
2011-01-01	3.4662
2011-04-01	3.2727
2011-07-01	3.4218
2011-10-01	3.1536
2012-01-01	3.0295
2012-04-01	3.1716
2012-07-01	3.3268
2012-10-01	2.0002
2013-01-01	1.6378
2013-04-01	1.7978
2013-07-01	1.9667
2013-10-01	3.1730
2014-01-01	3.5937
2014-04-01	3.4873
2014-07-01	2.8926
2014-10-01	2.3911
2015-01-01	2.0818
2015-04-01	1.8738