Quarter	Billions of US Dollars
1987-01-01	0.556
1987-04-01	0.106
1987-07-01	0.016
1987-10-01	0.563
1988-01-01	0.705
1988-04-01	1.276
1988-07-01	1.811
1988-10-01	0.162
1989-01-01	1.683
1989-04-01	-0.214
1989-07-01	3.440
1989-10-01	2.918
1990-01-01	2.538
1990-04-01	0.951
1990-07-01	1.888
1990-10-01	0.772
1991-01-01	0.121
1991-04-01	0.775
1991-07-01	0.870
1991-10-01	0.895
1992-01-01	1.062
1992-04-01	1.554
1992-07-01	0.352
1992-10-01	0.354
1993-01-01	0.366
1993-04-01	4.218
1993-07-01	8.803
1993-10-01	3.611
1994-01-01	8.041
1994-04-01	4.619
1994-07-01	4.369
1994-10-01	4.193
1995-01-01	8.756
1995-04-01	4.232
1995-07-01	6.014
1995-10-01	3.495
1996-01-01	5.938
1996-04-01	10.572
1996-07-01	10.757
1996-10-01	14.508
1997-01-01	5.712
1997-04-01	9.484
1997-07-01	9.752
1997-10-01	2.908
1998-01-01	8.513
1998-04-01	3.129
1998-07-01	11.205
1998-10-01	-1.140
1999-01-01	14.992
1999-04-01	6.273
1999-07-01	21.093
1999-10-01	12.547
2000-01-01	26.243
2000-04-01	19.417
2000-07-01	9.388
2000-10-01	17.215
2001-01-01	7.181
2001-04-01	4.465
2001-07-01	3.181
2001-10-01	7.427
2002-01-01	-2.829
2002-04-01	10.780
2002-07-01	17.022
2002-10-01	7.065
2003-01-01	21.816
2003-04-01	25.142
2003-07-01	21.447
2003-10-01	39.552
2004-01-01	47.342
2004-04-01	40.506
2004-07-01	44.672
2004-10-01	52.246
2005-01-01	44.856
2005-04-01	48.371
2005-07-01	59.629
2005-10-01	37.114
2006-01-01	53.550
2006-04-01	19.395
2006-07-01	46.422
2006-10-01	50.793
2007-01-01	92.673
2007-04-01	82.690
2007-07-01	101.600
2007-10-01	44.883
2008-01-01	69.443
2008-04-01	160.400
2008-07-01	70.225
2008-10-01	152.300
2009-01-01	12.184
2009-04-01	16.591
2009-07-01	54.806
2009-10-01	-50.948
2010-01-01	56.492
2010-04-01	-32.456
2010-07-01	65.257
2010-10-01	-83.709
2011-01-01	36.757
2011-04-01	12.721
2011-07-01	-29.424
2011-10-01	-91.851
2012-01-01	50.931
2012-04-01	-23.587
2012-07-01	-63.186
2012-10-01	-46.708
2013-01-01	-27.430
2013-04-01	-63.365
2013-07-01	-39.131
2013-10-01	-0.081
2014-01-01	-4.841
2014-04-01	13.186
2014-07-01	14.845
2014-10-01	-31.805
2015-01-01	-7.578
2015-04-01	2.501