Quarter	Billions of US Dollars
1987-01-01	1.7040
1987-04-01	2.0530
1987-07-01	2.2980
1987-10-01	2.2840
1988-01-01	2.2060
1988-04-01	2.3380
1988-07-01	2.5340
1988-10-01	3.1270
1989-01-01	3.0200
1989-04-01	3.2390
1989-07-01	2.9190
1989-10-01	3.7640
1990-01-01	4.1360
1990-04-01	4.5620
1990-07-01	5.1060
1990-10-01	5.0150
1991-01-01	6.6730
1991-04-01	7.7700
1991-07-01	7.5380
1991-10-01	8.9520
1992-01-01	8.1350
1992-04-01	8.5300
1992-07-01	7.6720
1992-10-01	6.3540
1993-01-01	3.5520
1993-04-01	3.0950
1993-07-01	4.5069
1993-10-01	5.3316
1994-01-01	5.0268
1994-04-01	6.5263
1994-07-01	7.5513
1994-10-01	6.9329
1995-01-01	6.3314
1995-04-01	6.6790
1995-07-01	8.1294
1995-10-01	12.1711
1996-01-01	11.9865
1996-04-01	12.0712
1996-07-01	10.3299
1996-10-01	9.2815
1997-01-01	8.5212
1997-04-01	7.9854
1997-07-01	6.9314
1997-10-01	9.7088
1998-01-01	9.6442
1998-04-01	9.0669
1998-07-01	9.0779
1998-10-01	9.4785
1999-01-01	11.9738
1999-04-01	11.2364
1999-07-01	15.1279
1999-10-01	15.4527
2000-01-01	13.5218
2000-04-01	18.7130
2000-07-01	16.2646
2000-10-01	18.5764
2001-01-01	18.7091
2001-04-01	15.7159
2001-07-01	17.5638
2001-10-01	20.7543
2002-01-01	18.5194
2002-04-01	21.5260
2002-07-01	20.1159
2002-10-01	15.0257
2003-01-01	11.5446
2003-04-01	12.6299
2003-07-01	13.1224
2003-10-01	15.3106
2004-01-01	18.4673
2004-04-01	19.4999
2004-07-01	19.6275
2004-10-01	19.3641
2005-01-01	17.4122
2005-04-01	16.2128
2005-07-01	16.6536
2005-10-01	16.6147
2006-01-01	16.0501
2006-04-01	26.9510
2006-07-01	20.2268
2006-10-01	25.7906
2007-01-01	34.6497
2007-04-01	38.0294
2007-07-01	46.9360
2007-10-01	53.4818
2008-01-01	64.2307
2008-04-01	75.3086
2008-07-01	72.6504
2008-10-01	52.7881
2009-01-01	54.5262
2009-04-01	55.9853
2009-07-01	58.0681
2009-10-01	45.2458
2010-01-01	44.5194
2010-04-01	37.6797
2010-07-01	60.8774
2010-10-01	40.1635
2011-01-01	43.7464
2011-04-01	42.8275
2011-07-01	28.3768
2011-10-01	20.6397
2012-01-01	23.9082
2012-04-01	15.0878
2012-07-01	15.1901
2012-10-01	19.1881
2013-01-01	20.3165
2013-04-01	17.4015
2013-07-01	19.7036
2013-10-01	11.1883
2014-01-01	13.4069
2014-04-01	13.2157
2014-07-01	14.1191
2014-10-01	11.5101
2015-01-01	8.0333
2015-04-01	8.6985