Quarter	Billions of US Dollars
1987-01-01	0.0581
1987-04-01	0.3172
1987-07-01	0.1764
1987-10-01	0.1292
1988-01-01	-0.0102
1988-04-01	1.0567
1988-07-01	1.1344
1988-10-01	0.9441
1989-01-01	1.3996
1989-04-01	0.5494
1989-07-01	0.2615
1989-10-01	0.7647
1990-01-01	0.4435
1990-04-01	0.0042
1990-07-01	-0.5582
1990-10-01	-0.4184
1991-01-01	-0.3898
1991-04-01	-0.5283
1991-07-01	-0.6695
1991-10-01	-0.2334
1992-01-01	-1.2655
1992-04-01	-1.2443
1992-07-01	-0.3068
1992-10-01	-0.0055
1993-01-01	-0.7536
1993-04-01	-0.5868
1993-07-01	0.9844
1993-10-01	0.0461
1994-01-01	-0.5487
1994-04-01	-0.6740
1994-07-01	0.3677
1994-10-01	-0.1037
1995-01-01	0.4417
1995-04-01	0.4035
1995-07-01	-0.3991
1995-10-01	-0.6243
1996-01-01	1.1812
1996-04-01	0.6446
1996-07-01	1.0744
1996-10-01	1.6841
1997-01-01	0.5163
1997-04-01	1.5915
1997-07-01	0.6156
1997-10-01	0.7966
1998-01-01	2.3807
1998-04-01	1.4942
1998-07-01	0.1799
1998-10-01	0.2866
1999-01-01	3.5543
1999-04-01	2.3523
1999-07-01	1.7057
1999-10-01	-1.0692
2000-01-01	-0.2410
2000-04-01	-0.9343
2000-07-01	-1.2616
2000-10-01	1.0339
2001-01-01	-0.6158
2001-04-01	-0.7603
2001-07-01	0.9519
2001-10-01	1.5361
2002-01-01	1.8281
2002-04-01	-2.1096
2002-07-01	0.2972
2002-10-01	-0.4264
2003-01-01	1.4154
2003-04-01	-0.1987
2003-07-01	-0.5503
2003-10-01	0.0266
2004-01-01	-1.4079
2004-04-01	3.2480
2004-07-01	1.1416
2004-10-01	-0.6940
2005-01-01	-0.3438
2005-04-01	-0.5788
2005-07-01	0.9225
2005-10-01	2.9624
2006-01-01	4.9300
2006-04-01	-0.5779
2006-07-01	3.8778
2006-10-01	3.7228
2007-01-01	6.2650
2007-04-01	8.3530
2007-07-01	-1.0074
2007-10-01	5.1747
2008-01-01	9.2502
2008-04-01	18.9886
2008-07-01	11.7866
2008-10-01	-6.3873
2009-01-01	-3.1480
2009-04-01	-8.5044
2009-07-01	-4.0333
2009-10-01	-2.6149
2010-01-01	0.6897
2010-04-01	9.0423
2010-07-01	5.5102
2010-10-01	3.7011
2011-01-01	10.2517
2011-04-01	-2.3437
2011-07-01	7.6047
2011-10-01	11.9673
2012-01-01	15.8435
2012-04-01	-2.0080
2012-07-01	5.6312
2012-10-01	8.6681
2013-01-01	-2.8197
2013-04-01	10.3950
2013-07-01	27.2740
2013-10-01	22.5389
2014-01-01	4.2161
2014-04-01	16.5439
2014-07-01	20.7593
2014-10-01	2.4676
2015-01-01	12.2687
2015-04-01	9.7668