Quarter	Billions of US Dollars
1987-01-01	1.3023
1987-04-01	1.2928
1987-07-01	1.2918
1987-10-01	1.8824
1988-01-01	2.3379
1988-04-01	2.2782
1988-07-01	2.4475
1988-10-01	2.8592
1989-01-01	3.0994
1989-04-01	3.0473
1989-07-01	3.4225
1989-10-01	3.6609
1990-01-01	3.8121
1990-04-01	3.9994
1990-07-01	4.4946
1990-10-01	5.0016
1991-01-01	4.6932
1991-04-01	4.6390
1991-07-01	5.0170
1991-10-01	6.5679
1992-01-01	6.6099
1992-04-01	7.0665
1992-07-01	7.6973
1992-10-01	6.8695
1993-01-01	8.3259
1993-04-01	9.3835
1993-07-01	11.1940
1993-10-01	11.2397
1994-01-01	12.7671
1994-04-01	13.4103
1994-07-01	14.1510
1994-10-01	14.5391
1995-01-01	15.7025
1995-04-01	16.7861
1995-07-01	16.1573
1995-10-01	16.4524
1996-01-01	15.9607
1996-04-01	16.1655
1996-07-01	15.5061
1996-10-01	14.9331
1997-01-01	13.9344
1997-04-01	14.4532
1997-07-01	13.8526
1997-10-01	12.8722
1998-01-01	12.2675
1998-04-01	12.0683
1998-07-01	12.6839
1998-10-01	13.5956
1999-01-01	12.2439
1999-04-01	11.3350
1999-07-01	11.3281
1999-10-01	10.9166
2000-01-01	9.6747
2000-04-01	9.1609
2000-07-01	8.1657
2000-10-01	7.9695
2001-01-01	7.4994
2001-04-01	7.0969
2001-07-01	7.4008
2001-10-01	6.3114
2002-01-01	5.7669
2002-04-01	6.5106
2002-07-01	6.2534
2002-10-01	6.4111
2003-01-01	5.9247
2003-04-01	5.3625
2003-07-01	4.8308
2003-10-01	4.8173
2004-01-01	3.2811
2004-04-01	3.2119
2004-07-01	3.1808
2004-10-01	3.3402
2005-01-01	3.0357
2005-04-01	3.2706
2005-07-01	3.0000
2005-10-01	2.6534
2006-01-01	3.0150
2006-04-01	3.2353
2006-07-01	3.1707
2006-10-01	5.7294
2007-01-01	6.1606
2007-04-01	6.6009
2007-07-01	6.8365
2007-10-01	6.6989
2008-01-01	6.7363
2008-04-01	6.6671
2008-07-01	6.7374
2008-10-01	6.7273
2009-01-01	6.5416
2009-04-01	6.2522
2009-07-01	6.3863
2009-10-01	6.3777
2010-01-01	6.1980
2010-04-01	5.6540
2010-07-01	5.6225
2010-10-01	5.6395
2011-01-01	5.1156
2011-04-01	6.0354
2011-07-01	6.6067
2011-10-01	5.3763
2012-01-01	6.2893
2012-04-01	6.3719
2012-07-01	6.3451
2012-10-01	6.7186
2013-01-01	7.0993
2013-04-01	8.0984
2013-07-01	9.1935
2013-10-01	9.6255
2014-01-01	10.7679
2014-04-01	11.6291
2014-07-01	11.1932
2014-10-01	11.2769
2015-01-01	11.0310
2015-04-01	11.1122