Quarter	Billions of US Dollars
1987-01-01	1.0940
1987-04-01	0.8940
1987-07-01	1.0020
1987-10-01	0.9580
1988-01-01	1.2270
1988-04-01	0.9890
1988-07-01	0.9840
1988-10-01	0.9510
1989-01-01	0.8690
1989-04-01	1.4430
1989-07-01	1.6180
1989-10-01	1.9240
1990-01-01	2.2380
1990-04-01	2.9420
1990-07-01	2.4180
1990-10-01	2.3180
1991-01-01	1.9750
1991-04-01	1.9680
1991-07-01	1.6650
1991-10-01	1.9990
1992-01-01	3.0750
1992-04-01	3.4080
1992-07-01	3.1250
1992-10-01	2.2680
1993-01-01	2.6540
1993-04-01	2.8980
1993-07-01	0.3377
1993-10-01	0.4358
1994-01-01	0.5544
1994-04-01	0.4401
1994-07-01	0.8590
1994-10-01	0.8408
1995-01-01	0.3446
1995-04-01	0.3273
1995-07-01	0.3789
1995-10-01	0.5085
1996-01-01	0.5789
1996-04-01	0.6302
1996-07-01	0.6205
1996-10-01	0.8375
1997-01-01	0.9040
1997-04-01	0.8759
1997-07-01	0.8451
1997-10-01	0.6596
1998-01-01	0.5048
1998-04-01	1.3517
1998-07-01	1.8184
1998-10-01	1.8441
1999-01-01	2.3674
1999-04-01	1.7003
1999-07-01	1.7795
1999-10-01	1.9577
2000-01-01	1.7133
2000-04-01	1.4863
2000-07-01	1.8763
2000-10-01	1.2522
2001-01-01	1.2501
2001-04-01	1.2402
2001-07-01	0.7330
2001-10-01	0.8914
2002-01-01	1.0447
2002-04-01	0.9690
2002-07-01	1.0268
2002-10-01	1.3125
2003-01-01	1.4464
2003-04-01	1.4973
2003-07-01	1.4460
2003-10-01	1.4854
2004-01-01	1.3631
2004-04-01	1.5690
2004-07-01	2.4462
2004-10-01	3.2951
2005-01-01	5.6834
2005-04-01	7.3560
2005-07-01	6.8037
2005-10-01	6.0074
2006-01-01	8.7539
2006-04-01	9.4380
2006-07-01	6.7989
2006-10-01	9.4998
2007-01-01	15.4630
2007-04-01	15.8591
2007-07-01	12.1621
2007-10-01	12.8633
2008-01-01	8.0324
2008-04-01	10.5746
2008-07-01	13.3462
2008-10-01	10.3363
2009-01-01	4.9409
2009-04-01	5.3380
2009-07-01	8.4656
2009-10-01	9.8471
2010-01-01	10.7442
2010-04-01	9.7143
2010-07-01	10.1102
2010-10-01	9.3689
2011-01-01	8.6540
2011-04-01	8.0631
2011-07-01	7.4932
2011-10-01	6.7569
2012-01-01	6.5137
2012-04-01	6.3651
2012-07-01	5.9300
2012-10-01	5.3816
2013-01-01	5.0504
2013-04-01	4.7464
2013-07-01	4.3145
2013-10-01	4.1380
2014-01-01	3.8949
2014-04-01	2.9957
2014-07-01	2.9111
2014-10-01	3.6969
2015-01-01	1.8859
2015-04-01	1.5512