Quarter	Billions of US Dollars
1987-01-01	0.64463
1987-04-01	0.64223
1987-07-01	0.64810
1987-10-01	0.67704
1988-01-01	0.59023
1988-04-01	0.58077
1988-07-01	0.57682
1988-10-01	0.53206
1989-01-01	0.45487
1989-04-01	0.55280
1989-07-01	0.55509
1989-10-01	0.53882
1990-01-01	0.48578
1990-04-01	0.39000
1990-07-01	0.34000
1990-10-01	1.22700
1991-01-01	0.33500
1991-04-01	0.46000
1991-07-01	0.73800
1991-10-01	1.21792
1992-01-01	0.63375
1992-04-01	0.48887
1992-07-01	0.44906
1992-10-01	0.70045
1993-01-01	0.72145
1993-04-01	1.49232
1993-07-01	6.22827
1993-10-01	6.10826
1994-01-01	7.72646
1994-04-01	8.42590
1994-07-01	8.14706
1994-10-01	7.17776
1995-01-01	5.41666
1995-04-01	5.40147
1995-07-01	5.63670
1995-10-01	5.17949
1996-01-01	5.21617
1996-04-01	5.17489
1996-07-01	5.09176
1996-10-01	4.91076
1997-01-01	4.34704
1997-04-01	3.52751
1997-07-01	3.92430
1997-10-01	3.43911
1998-01-01	3.42102
1998-04-01	3.19467
1998-07-01	3.14084
1998-10-01	2.86746
1999-01-01	3.03387
1999-04-01	2.87081
1999-07-01	2.85255
1999-10-01	2.81611
2000-01-01	2.73938
2000-04-01	2.50912
2000-07-01	2.12882
2000-10-01	3.42241
2001-01-01	3.78632
2001-04-01	4.32423
2001-07-01	2.03651
2001-10-01	2.04072
2002-01-01	2.00224
2002-04-01	1.99290
2002-07-01	1.67525
2002-10-01	1.86557
2003-01-01	1.85959
2003-04-01	1.86900
2003-07-01	1.67031
2003-10-01	1.46548
2004-01-01	1.30890
2004-04-01	1.46764
2004-07-01	1.48314
2004-10-01	1.69506
2005-01-01	1.48840
2005-04-01	1.68433
2005-07-01	1.57089
2005-10-01	1.44923
2006-01-01	1.55330
2006-04-01	1.44179
2006-07-01	1.42157
2006-10-01	1.87122
2007-01-01	2.17028
2007-04-01	2.20719
2007-07-01	2.35571
2007-10-01	2.15525
2008-01-01	2.07759
2008-04-01	2.08243
2008-07-01	2.03125
2008-10-01	2.25133
2009-01-01	1.80499
2009-04-01	1.74807
2009-07-01	1.83262
2009-10-01	1.74240
2010-01-01	1.88385
2010-04-01	1.81310
2010-07-01	2.29177
2010-10-01	2.26515
2011-01-01	2.14796
2011-04-01	2.19959
2011-07-01	2.45061
2011-10-01	1.98952
2012-01-01	1.97037
2012-04-01	2.20099
2012-07-01	2.09760
2012-10-01	2.19473
2013-01-01	2.23684
2013-04-01	2.38686
2013-07-01	2.23063
2013-10-01	2.18803
2014-01-01	2.55028
2014-04-01	3.44879
2014-07-01	3.26244
2014-10-01	3.18005
2015-01-01	2.90204
2015-04-01	3.86026