Quarter	Billions of US Dollars
1987-01-01	0.1898
1987-04-01	0.2678
1987-07-01	0.2002
1987-10-01	0.0497
1988-01-01	-0.2330
1988-04-01	0.0773
1988-07-01	0.0163
1988-10-01	-0.1332
1989-01-01	0.0349
1989-04-01	-0.1389
1989-07-01	0.1649
1989-10-01	0.0418
1990-01-01	0.3630
1990-04-01	0.4542
1990-07-01	0.3841
1990-10-01	0.0984
1991-01-01	0.1785
1991-04-01	0.4989
1991-07-01	0.6073
1991-10-01	0.6760
1992-01-01	0.7616
1992-04-01	1.3477
1992-07-01	1.0578
1992-10-01	0.6387
1993-01-01	2.5415
1993-04-01	0.6234
1993-07-01	3.4864
1993-10-01	3.0365
1994-01-01	4.0922
1994-04-01	1.8817
1994-07-01	5.6944
1994-10-01	5.4005
1995-01-01	3.8476
1995-04-01	3.6900
1995-07-01	7.1140
1995-10-01	7.5929
1996-01-01	7.5587
1996-04-01	6.2551
1996-07-01	5.2603
1996-10-01	12.0457
1997-01-01	12.0484
1997-04-01	7.8856
1997-07-01	6.4205
1997-10-01	2.9487
1998-01-01	12.5750
1998-04-01	10.7045
1998-07-01	5.4321
1998-10-01	0.6842
1999-01-01	13.7974
1999-04-01	15.1020
1999-07-01	25.4853
1999-10-01	17.3416
2000-01-01	12.8683
2000-04-01	22.5946
2000-07-01	10.4540
2000-10-01	8.5680
2001-01-01	20.7974
2001-04-01	9.9419
2001-07-01	13.2849
2001-10-01	3.4283
2002-01-01	12.7818
2002-04-01	7.3190
2002-07-01	12.6596
2002-10-01	9.6958
2003-01-01	23.3294
2003-04-01	6.3206
2003-07-01	7.8568
2003-10-01	20.1868
2004-01-01	46.0647
2004-04-01	14.5126
2004-07-01	31.5070
2004-10-01	3.3798
2005-01-01	18.3440
2005-04-01	20.7438
2005-07-01	5.7238
2005-10-01	-3.2077
2006-01-01	18.2277
2006-04-01	7.6952
2006-07-01	6.9569
2006-10-01	6.9678
2007-01-01	30.5686
2007-04-01	18.2952
2007-07-01	2.6591
2007-10-01	10.0655
2008-01-01	-6.0493
2008-04-01	-1.6023
2008-07-01	-33.7387
2008-10-01	-17.6852
2009-01-01	-59.2710
2009-04-01	-18.8176
2009-07-01	-23.2775
2009-10-01	-12.9686
2010-01-01	-1.1915
2010-04-01	0.5416
2010-07-01	-10.3308
2010-10-01	-6.6106
2011-01-01	12.8156
2011-04-01	-6.9962
2011-07-01	12.2347
2011-10-01	4.9130
2012-01-01	9.9338
2012-04-01	11.2788
2012-07-01	-12.5326
2012-10-01	-5.1839
2013-01-01	-19.0152
2013-04-01	-1.4378
2013-07-01	-8.5228
2013-10-01	-7.2202
2014-01-01	0.2226
2014-04-01	-6.0544
2014-07-01	-0.5641
2014-10-01	0.3212
2015-01-01	-1.9980
2015-04-01	-7.9222