Quarter	Billions of US Dollars
1987-01-01	0.1290
1987-04-01	-0.0155
1987-07-01	-0.0507
1987-10-01	0.0589
1988-01-01	-0.2696
1988-04-01	0.0037
1988-07-01	0.6116
1988-10-01	0.0276
1989-01-01	0.3208
1989-04-01	0.0804
1989-07-01	0.5440
1989-10-01	0.4405
1990-01-01	0.2640
1990-04-01	-0.3444
1990-07-01	0.2089
1990-10-01	0.0504
1991-01-01	0.6941
1991-04-01	1.0784
1991-07-01	0.2864
1991-10-01	0.1980
1992-01-01	0.9120
1992-04-01	0.9919
1992-07-01	0.5722
1992-10-01	0.6198
1993-01-01	0.8807
1993-04-01	0.8556
1993-07-01	6.0477
1993-10-01	2.1564
1994-01-01	3.8752
1994-04-01	2.1443
1994-07-01	2.1671
1994-10-01	1.3839
1995-01-01	-0.7806
1995-04-01	1.5088
1995-07-01	2.6878
1995-10-01	2.1269
1996-01-01	3.9312
1996-04-01	6.2131
1996-07-01	0.6421
1996-10-01	5.9455
1997-01-01	4.3395
1997-04-01	3.2544
1997-07-01	5.6183
1997-10-01	-3.4251
1998-01-01	0.6651
1998-04-01	1.2135
1998-07-01	-4.0999
1998-10-01	-3.4864
1999-01-01	-2.5935
1999-04-01	-0.5531
1999-07-01	-1.6860
1999-10-01	0.7919
2000-01-01	2.2554
2000-04-01	-2.0173
2000-07-01	-1.4146
2000-10-01	-1.3413
2001-01-01	-1.2413
2001-04-01	-0.6958
2001-07-01	-5.6766
2001-10-01	-0.1113
2002-01-01	-1.4999
2002-04-01	0.1122
2002-07-01	-0.7883
2002-10-01	0.5444
2003-01-01	2.3273
2003-04-01	4.0577
2003-07-01	1.9567
2003-10-01	3.7026
2004-01-01	5.5126
2004-04-01	2.3811
2004-07-01	3.7157
2004-10-01	4.7678
2005-01-01	5.3485
2005-04-01	6.0457
2005-07-01	3.9927
2005-10-01	14.3272
2006-01-01	8.0646
2006-04-01	10.9585
2006-07-01	10.4487
2006-10-01	16.7918
2007-01-01	22.9487
2007-04-01	22.4481
2007-07-01	0.7890
2007-10-01	7.7391
2008-01-01	7.7863
2008-04-01	12.5557
2008-07-01	-0.1265
2008-10-01	-13.5580
2009-01-01	-5.1087
2009-04-01	5.3941
2009-07-01	3.3247
2009-10-01	0.7829
2010-01-01	10.6787
2010-04-01	0.9553
2010-07-01	21.5055
2010-10-01	22.2107
2011-01-01	18.3726
2011-04-01	21.2440
2011-07-01	3.4185
2011-10-01	9.5093
2012-01-01	36.8590
2012-04-01	17.7329
2012-07-01	50.8323
2012-10-01	37.2169
2013-01-01	33.2794
2013-04-01	21.0012
2013-07-01	23.8039
2013-10-01	32.1062
2014-01-01	30.8940
2014-04-01	35.9569
2014-07-01	27.9967
2014-10-01	30.7701
2015-01-01	-1.3502
2015-04-01	15.1253