Quarter	Billions of US Dollars
1987-01-01	0.6765
1987-04-01	0.3263
1987-07-01	0.2598
1987-10-01	-0.2203
1988-01-01	0.0444
1988-04-01	0.4423
1988-07-01	0.2008
1988-10-01	0.6210
1989-01-01	0.4261
1989-04-01	0.1246
1989-07-01	0.3508
1989-10-01	-0.3136
1990-01-01	0.4233
1990-04-01	-0.8862
1990-07-01	-0.2300
1990-10-01	-0.3383
1991-01-01	0.6737
1991-04-01	-0.3118
1991-07-01	0.3412
1991-10-01	0.6887
1992-01-01	0.4342
1992-04-01	1.4073
1992-07-01	0.4753
1992-10-01	1.7100
1993-01-01	1.5559
1993-04-01	2.4038
1993-07-01	2.9345
1993-10-01	4.0230
1994-01-01	4.1462
1994-04-01	0.9974
1994-07-01	4.3560
1994-10-01	5.9424
1995-01-01	4.4238
1995-04-01	3.0580
1995-07-01	2.9022
1995-10-01	2.4349
1996-01-01	4.8858
1996-04-01	4.8423
1996-07-01	2.8321
1996-10-01	3.2500
1997-01-01	2.7326
1997-04-01	1.7722
1997-07-01	4.3821
1997-10-01	2.2507
1998-01-01	2.8764
1998-04-01	3.0036
1998-07-01	6.6820
1998-10-01	6.5812
1999-01-01	8.0200
1999-04-01	9.7126
1999-07-01	9.4297
1999-10-01	1.2976
2000-01-01	9.9291
2000-04-01	9.6013
2000-07-01	1.0256
2000-10-01	4.7050
2001-01-01	5.9443
2001-04-01	2.4264
2001-07-01	2.7934
2001-10-01	4.3246
2002-01-01	8.6172
2002-04-01	6.0218
2002-07-01	7.4306
2002-10-01	8.0517
2003-01-01	16.1147
2003-04-01	12.9987
2003-07-01	9.4874
2003-10-01	13.0245
2004-01-01	12.3006
2004-04-01	10.4845
2004-07-01	8.7101
2004-10-01	12.5613
2005-01-01	16.6533
2005-04-01	13.4065
2005-07-01	7.5186
2005-10-01	9.7073
2006-01-01	21.6688
2006-04-01	23.2187
2006-07-01	8.8181
2006-10-01	15.4861
2007-01-01	31.6866
2007-04-01	18.7906
2007-07-01	16.0926
2007-10-01	10.1869
2008-01-01	10.3560
2008-04-01	21.2461
2008-07-01	-9.9797
2008-10-01	-0.2521
2009-01-01	16.3450
2009-04-01	47.7545
2009-07-01	9.3793
2009-10-01	8.5773
2010-01-01	41.1577
2010-04-01	-13.6502
2010-07-01	36.8932
2010-10-01	13.9830
2011-01-01	21.4910
2011-04-01	18.0887
2011-07-01	-0.4107
2011-10-01	0.3654
2012-01-01	14.5741
2012-04-01	-4.1543
2012-07-01	13.2534
2012-10-01	-14.2474
2013-01-01	-11.1081
2013-04-01	4.5176
2013-07-01	8.6344
2013-10-01	14.5485
2014-01-01	-35.0570
2014-04-01	-6.7713
2014-07-01	-2.5298
2014-10-01	-14.0195
2015-01-01	5.9294
2015-04-01	-4.9105