Quarter	Billions of US Dollars
1987-01-01	0.1774
1987-04-01	0.1876
1987-07-01	-0.0301
1987-10-01	-0.1459
1988-01-01	-0.0750
1988-04-01	-0.0423
1988-07-01	0.0774
1988-10-01	0.0777
1989-01-01	0.1471
1989-04-01	-0.0583
1989-07-01	-0.3610
1989-10-01	-0.1911
1990-01-01	0.0160
1990-04-01	-0.0112
1990-07-01	-0.1390
1990-10-01	-0.3408
1991-01-01	0.1394
1991-04-01	0.0626
1991-07-01	0.0217
1991-10-01	-0.1002
1992-01-01	-0.0983
1992-04-01	0.0319
1992-07-01	0.1658
1992-10-01	0.7816
1993-01-01	-0.0582
1993-04-01	-0.0697
1993-07-01	1.4080
1993-10-01	0.0922
1994-01-01	0.8887
1994-04-01	0.1144
1994-07-01	0.4264
1994-10-01	0.5057
1995-01-01	0.8191
1995-04-01	1.2965
1995-07-01	1.0521
1995-10-01	0.3410
1996-01-01	1.9696
1996-04-01	3.7286
1996-07-01	1.7422
1996-10-01	1.0263
1997-01-01	3.2195
1997-04-01	5.1620
1997-07-01	2.6298
1997-10-01	1.0752
1998-01-01	2.2699
1998-04-01	3.8658
1998-07-01	1.3732
1998-10-01	0.1051
1999-01-01	0.6076
1999-04-01	0.3512
1999-07-01	1.8382
1999-10-01	-0.6983
2000-01-01	-0.2270
2000-04-01	3.6273
2000-07-01	2.0607
2000-10-01	3.3025
2001-01-01	0.1009
2001-04-01	-1.3219
2001-07-01	-4.0682
2001-10-01	0.4788
2002-01-01	-0.0294
2002-04-01	6.4694
2002-07-01	-0.6625
2002-10-01	1.1214
2003-01-01	0.9216
2003-04-01	-1.7263
2003-07-01	2.9986
2003-10-01	7.6259
2004-01-01	31.7901
2004-04-01	6.2297
2004-07-01	17.7226
2004-10-01	19.3261
2005-01-01	11.4368
2005-04-01	2.8793
2005-07-01	23.1375
2005-10-01	1.9528
2006-01-01	7.3521
2006-04-01	-2.1637
2006-07-01	11.1564
2006-10-01	-9.7750
2007-01-01	22.1882
2007-04-01	3.7236
2007-07-01	16.1068
2007-10-01	-21.9511
2008-01-01	13.2035
2008-04-01	28.0878
2008-07-01	-3.5835
2008-10-01	-31.0512
2009-01-01	-6.3560
2009-04-01	2.4260
2009-07-01	-0.1024
2009-10-01	-9.7807
2010-01-01	11.6317
2010-04-01	-4.5621
2010-07-01	5.1316
2010-10-01	-8.9179
2011-01-01	1.6013
2011-04-01	-4.0562
2011-07-01	2.8689
2011-10-01	-4.9283
2012-01-01	9.6875
2012-04-01	-7.0152
2012-07-01	-1.8534
2012-10-01	-3.1275
2013-01-01	-3.3498
2013-04-01	-4.0944
2013-07-01	-11.5967
2013-10-01	2.0641
2014-01-01	7.1932
2014-04-01	17.3140
2014-07-01	23.7841
2014-10-01	6.7688
2015-01-01	-0.9261
2015-04-01	16.5818