Quarter	Billions of US Dollars
1987-01-01	1.4650
1987-04-01	2.0498
1987-07-01	2.4283
1987-10-01	1.1035
1988-01-01	1.2196
1988-04-01	0.5540
1988-07-01	2.2624
1988-10-01	1.3812
1989-01-01	4.3540
1989-04-01	3.5289
1989-07-01	0.9819
1989-10-01	1.1256
1990-01-01	1.9236
1990-04-01	-0.4467
1990-07-01	5.8911
1990-10-01	-0.1385
1991-01-01	3.6815
1991-04-01	-0.8984
1991-07-01	-0.2368
1991-10-01	-0.6198
1992-01-01	-1.0760
1992-04-01	-0.5082
1992-07-01	-0.1832
1992-10-01	0.5100
1993-01-01	-0.8409
1993-04-01	-1.2492
1993-07-01	0.2001
1993-10-01	-0.6083
1994-01-01	-0.5478
1994-04-01	-0.5514
1994-07-01	2.6385
1994-10-01	3.0548
1995-01-01	4.2806
1995-04-01	5.8355
1995-07-01	0.0455
1995-10-01	1.7364
1996-01-01	1.3884
1996-04-01	3.5356
1996-07-01	6.2218
1996-10-01	4.1034
1997-01-01	5.8493
1997-04-01	0.3868
1997-07-01	6.4123
1997-10-01	1.1534
1998-01-01	0.5423
1998-04-01	-2.9350
1998-07-01	4.1466
1998-10-01	-1.2708
1999-01-01	1.1596
1999-04-01	1.1099
1999-07-01	-0.2317
1999-10-01	0.8232
2000-01-01	0.7796
2000-04-01	1.0438
2000-07-01	-0.2774
2000-10-01	-0.7685
2001-01-01	-2.2017
2001-04-01	2.0791
2001-07-01	-3.1806
2001-10-01	0.0128
2002-01-01	-6.5282
2002-04-01	1.0572
2002-07-01	-4.0488
2002-10-01	-8.8219
2003-01-01	-1.9611
2003-04-01	0.4918
2003-07-01	-0.2507
2003-10-01	-0.4680
2004-01-01	-1.8031
2004-04-01	1.6910
2004-07-01	3.8115
2004-10-01	-0.3388
2005-01-01	1.9156
2005-04-01	-2.6769
2005-07-01	4.0036
2005-10-01	1.0723
2006-01-01	7.3319
2006-04-01	1.3253
2006-07-01	7.5260
2006-10-01	2.7710
2007-01-01	2.8320
2007-04-01	5.9974
2007-07-01	-1.3285
2007-10-01	2.7589
2008-01-01	3.0546
2008-04-01	2.0371
2008-07-01	-6.4660
2008-10-01	-1.9211
2009-01-01	-0.5656
2009-04-01	1.0310
2009-07-01	3.1599
2009-10-01	-0.2963
2010-01-01	4.3995
2010-04-01	-8.7856
2010-07-01	8.2777
2010-10-01	2.0210
2011-01-01	5.2459
2011-04-01	-1.4620
2011-07-01	3.5127
2011-10-01	-1.3895
2012-01-01	20.3324
2012-04-01	-1.6406
2012-07-01	3.3908
2012-10-01	2.3801
2013-01-01	6.7891
2013-04-01	4.0879
2013-07-01	11.2345
2013-10-01	7.1646
2014-01-01	0.4303
2014-04-01	14.0657
2014-07-01	10.2798
2014-10-01	-1.3459
2015-01-01	4.8508
2015-04-01	1.8326