Quarter	Billions of US Dollars
1987-01-01	-0.9830
1987-04-01	0.1309
1987-07-01	0.1137
1987-10-01	-0.0215
1988-01-01	0.1342
1988-04-01	-0.1064
1988-07-01	0.1980
1988-10-01	0.4556
1989-01-01	0.2354
1989-04-01	0.6795
1989-07-01	0.3064
1989-10-01	0.5721
1990-01-01	1.1874
1990-04-01	0.1691
1990-07-01	-0.3609
1990-10-01	0.2378
1991-01-01	0.5272
1991-04-01	-0.1374
1991-07-01	0.4778
1991-10-01	0.0751
1992-01-01	0.3052
1992-04-01	0.0756
1992-07-01	0.1755
1992-10-01	-0.1500
1993-01-01	-0.2038
1993-04-01	-0.1236
1993-07-01	0.7931
1993-10-01	-0.3201
1994-01-01	-0.1674
1994-04-01	-0.0034
1994-07-01	0.1185
1994-10-01	-0.0748
1995-01-01	0.4715
1995-04-01	0.2966
1995-07-01	0.6824
1995-10-01	0.0898
1996-01-01	1.1790
1996-04-01	0.8707
1996-07-01	0.2197
1996-10-01	0.9353
1997-01-01	2.2939
1997-04-01	2.9165
1997-07-01	6.2097
1997-10-01	1.7457
1998-01-01	2.4316
1998-04-01	3.3878
1998-07-01	4.1430
1998-10-01	-0.2328
1999-01-01	1.5749
1999-04-01	3.2897
1999-07-01	6.4176
1999-10-01	5.2397
2000-01-01	-0.9120
2000-04-01	0.7094
2000-07-01	7.0326
2000-10-01	18.3180
2001-01-01	7.5284
2001-04-01	4.8738
2001-07-01	3.1192
2001-10-01	12.2887
2002-01-01	3.7055
2002-04-01	6.4182
2002-07-01	12.2172
2002-10-01	7.8741
2003-01-01	4.2949
2003-04-01	9.7250
2003-07-01	6.3267
2003-10-01	13.3843
2004-01-01	3.3696
2004-04-01	12.6578
2004-07-01	1.1290
2004-10-01	8.2739
2005-01-01	7.7764
2005-04-01	10.7872
2005-07-01	10.6757
2005-10-01	36.7490
2006-01-01	12.2690
2006-04-01	21.7412
2006-07-01	16.6659
2006-10-01	31.5038
2007-01-01	26.8987
2007-04-01	19.2739
2007-07-01	-0.6644
2007-10-01	-3.8525
2008-01-01	7.1532
2008-04-01	36.0869
2008-07-01	4.3562
2008-10-01	18.7902
2009-01-01	26.4082
2009-04-01	16.2292
2009-07-01	8.3065
2009-10-01	-4.6601
2010-01-01	19.1566
2010-04-01	-1.4054
2010-07-01	20.5069
2010-10-01	-4.0643
2011-01-01	1.2158
2011-04-01	6.9673
2011-07-01	-0.0130
2011-10-01	27.4151
2012-01-01	-0.8620
2012-04-01	-0.2987
2012-07-01	-4.2607
2012-10-01	8.4943
2013-01-01	-1.8644
2013-04-01	-3.8281
2013-07-01	1.8398
2013-10-01	-21.6022
2014-01-01	23.7013
2014-04-01	10.1494
2014-07-01	0.6109
2014-10-01	9.4263
2015-01-01	-7.8595
2015-04-01	15.3937