Quarter	Billions of US Dollars
1987-01-01	0.3669
1987-04-01	1.3349
1987-07-01	0.0479
1987-10-01	0.5999
1988-01-01	1.5894
1988-04-01	2.6628
1988-07-01	1.0596
1988-10-01	0.8845
1989-01-01	2.8969
1989-04-01	1.0350
1989-07-01	0.8065
1989-10-01	0.7226
1990-01-01	2.2574
1990-04-01	1.0537
1990-07-01	1.8507
1990-10-01	1.4086
1991-01-01	0.6038
1991-04-01	2.3444
1991-07-01	2.2228
1991-10-01	3.2404
1992-01-01	1.6643
1992-04-01	0.8596
1992-07-01	0.1814
1992-10-01	2.3917
1993-01-01	1.2563
1993-04-01	-2.2845
1993-07-01	7.3675
1993-10-01	2.2113
1994-01-01	2.4102
1994-04-01	-1.3540
1994-07-01	2.3915
1994-10-01	0.4773
1995-01-01	-0.6656
1995-04-01	-0.1944
1995-07-01	0.4450
1995-10-01	2.1253
1996-01-01	-0.1531
1996-04-01	5.2906
1996-07-01	1.5876
1996-10-01	-0.9815
1997-01-01	4.3398
1997-04-01	-3.5305
1997-07-01	3.5968
1997-10-01	-1.4123
1998-01-01	2.6200
1998-04-01	-1.1522
1998-07-01	1.0127
1998-10-01	-1.8841
1999-01-01	4.4264
1999-04-01	3.6085
1999-07-01	3.7757
1999-10-01	9.5709
2000-01-01	8.3789
2000-04-01	2.1503
2000-07-01	5.9882
2000-10-01	1.4453
2001-01-01	5.3242
2001-04-01	3.9584
2001-07-01	5.9545
2001-10-01	4.7984
2002-01-01	6.3622
2002-04-01	9.6767
2002-07-01	3.2664
2002-10-01	12.7357
2003-01-01	12.5975
2003-04-01	13.3908
2003-07-01	12.5283
2003-10-01	20.9885
2004-01-01	19.5542
2004-04-01	15.1881
2004-07-01	15.1721
2004-10-01	21.2843
2005-01-01	31.2791
2005-04-01	34.1805
2005-07-01	9.0437
2005-10-01	31.0729
2006-01-01	27.9970
2006-04-01	20.2388
2006-07-01	23.0256
2006-10-01	46.9771
2007-01-01	26.9453
2007-04-01	62.7320
2007-07-01	0.1800
2007-10-01	33.8069
2008-01-01	24.3649
2008-04-01	72.7842
2008-07-01	10.2538
2008-10-01	-39.7069
2009-01-01	-33.9835
2009-04-01	3.2686
2009-07-01	13.4381
2009-10-01	4.8093
2010-01-01	27.1818
2010-04-01	-26.6538
2010-07-01	19.4465
2010-10-01	0.1134
2011-01-01	63.4395
2011-04-01	9.8196
2011-07-01	-39.7874
2011-10-01	-13.1644
2012-01-01	-2.5886
2012-04-01	-9.0745
2012-07-01	0.1063
2012-10-01	2.6492
2013-01-01	2.8561
2013-04-01	-1.5741
2013-07-01	-4.1707
2013-10-01	-11.5615
2014-01-01	9.2621
2014-04-01	7.3015
2014-07-01	2.1509
2014-10-01	-25.6151
2015-01-01	-4.8294
2015-04-01	-22.0228