Quarter	Billions of US Dollars
1987-01-01	2.0753
1987-04-01	1.3832
1987-07-01	0.5365
1987-10-01	0.6695
1988-01-01	1.1326
1988-04-01	0.9233
1988-07-01	1.8286
1988-10-01	1.2886
1989-01-01	2.4136
1989-04-01	1.6427
1989-07-01	0.6102
1989-10-01	0.1818
1990-01-01	1.1820
1990-04-01	-0.3879
1990-07-01	3.3811
1990-10-01	0.3365
1991-01-01	3.3188
1991-04-01	0.7180
1991-07-01	-0.3093
1991-10-01	-0.2172
1992-01-01	-1.4875
1992-04-01	-0.6838
1992-07-01	2.7707
1992-10-01	-0.0018
1993-01-01	-2.5617
1993-04-01	-2.9784
1993-07-01	4.1096
1993-10-01	2.4591
1994-01-01	3.8341
1994-04-01	3.8922
1994-07-01	5.6652
1994-10-01	6.4847
1995-01-01	5.7613
1995-04-01	6.1404
1995-07-01	7.3879
1995-10-01	8.0797
1996-01-01	5.6501
1996-04-01	7.7258
1996-07-01	5.1639
1996-10-01	6.7749
1997-01-01	12.6573
1997-04-01	3.8158
1997-07-01	10.4303
1997-10-01	4.9248
1998-01-01	8.6631
1998-04-01	4.6458
1998-07-01	2.3492
1998-10-01	-1.7854
1999-01-01	5.5867
1999-04-01	9.4553
1999-07-01	3.7840
1999-10-01	3.4538
2000-01-01	11.8222
2000-04-01	1.1122
2000-07-01	5.6675
2000-10-01	6.4328
2001-01-01	14.3268
2001-04-01	3.2467
2001-07-01	0.8736
2001-10-01	0.2931
2002-01-01	0.2860
2002-04-01	13.7185
2002-07-01	-4.6066
2002-10-01	-6.9747
2003-01-01	5.7105
2003-04-01	1.2208
2003-07-01	-4.6741
2003-10-01	-2.1934
2004-01-01	-4.3264
2004-04-01	-2.8874
2004-07-01	3.0883
2004-10-01	1.9958
2005-01-01	8.7003
2005-04-01	-4.6978
2005-07-01	1.4806
2005-10-01	-0.0142
2006-01-01	5.5933
2006-04-01	4.6782
2006-07-01	6.8719
2006-10-01	7.8650
2007-01-01	-0.0370
2007-04-01	14.7511
2007-07-01	-2.9449
2007-10-01	-0.6495
2008-01-01	-9.5809
2008-04-01	-9.9967
2008-07-01	-11.0046
2008-10-01	-14.0105
2009-01-01	-6.2196
2009-04-01	-5.6624
2009-07-01	-4.7671
2009-10-01	-9.0387
2010-01-01	-1.4497
2010-04-01	-7.1137
2010-07-01	4.3505
2010-10-01	0.7968
2011-01-01	-1.1818
2011-04-01	9.7005
2011-07-01	-2.5961
2011-10-01	-0.8063
2012-01-01	21.4101
2012-04-01	-2.1486
2012-07-01	11.4901
2012-10-01	4.9790
2013-01-01	11.4368
2013-04-01	10.5799
2013-07-01	4.2447
2013-10-01	5.1880
2014-01-01	4.1160
2014-04-01	10.5078
2014-07-01	7.5309
2014-10-01	-9.5085
2015-01-01	-4.2801
2015-04-01	-0.0061