Quarter	Billions of US Dollars
1987-01-01	0.1045
1987-04-01	-0.0640
1987-07-01	0.0075
1987-10-01	0.0589
1988-01-01	-0.2696
1988-04-01	-0.0243
1988-07-01	0.6716
1988-10-01	0.0276
1989-01-01	0.2936
1989-04-01	0.1289
1989-07-01	0.5187
1989-10-01	0.4405
1990-01-01	0.2640
1990-04-01	-0.3844
1990-07-01	0.7992
1990-10-01	0.3125
1991-01-01	0.6441
1991-04-01	1.0784
1991-07-01	0.4234
1991-10-01	0.3790
1992-01-01	1.2350
1992-04-01	1.0619
1992-07-01	0.5722
1992-10-01	1.0018
1993-01-01	0.5907
1993-04-01	1.0411
1993-07-01	6.3138
1993-10-01	2.2779
1994-01-01	3.4036
1994-04-01	0.2511
1994-07-01	1.4892
1994-10-01	1.7971
1995-01-01	-1.4703
1995-04-01	0.7909
1995-07-01	2.7890
1995-10-01	2.1746
1996-01-01	2.7483
1996-04-01	3.6035
1996-07-01	3.0344
1996-10-01	5.9148
1997-01-01	2.9381
1997-04-01	3.7189
1997-07-01	5.1962
1997-10-01	-2.6047
1998-01-01	1.0103
1998-04-01	1.7226
1998-07-01	-3.9042
1998-10-01	-2.2061
1999-01-01	-2.8281
1999-04-01	-0.4243
1999-07-01	-2.0464
1999-10-01	0.0711
2000-01-01	2.0440
2000-04-01	-0.9441
2000-07-01	-2.4834
2000-10-01	-2.4894
2001-01-01	-0.8847
2001-04-01	-1.3915
2001-07-01	-4.3350
2001-10-01	1.1727
2002-01-01	-1.3374
2002-04-01	-0.5183
2002-07-01	-0.1598
2002-10-01	-0.4535
2003-01-01	2.2106
2003-04-01	3.7592
2003-07-01	1.8497
2003-10-01	1.3215
2004-01-01	5.8748
2004-04-01	0.9088
2004-07-01	2.9053
2004-10-01	3.8312
2005-01-01	5.1120
2005-04-01	2.6560
2005-07-01	4.5701
2005-10-01	8.6207
2006-01-01	4.4772
2006-04-01	7.7191
2006-07-01	9.3782
2006-10-01	10.0063
2007-01-01	12.5921
2007-04-01	15.5725
2007-07-01	4.3008
2007-10-01	4.3688
2008-01-01	7.3054
2008-04-01	3.7478
2008-07-01	1.0057
2008-10-01	-13.3129
2009-01-01	-0.8045
2009-04-01	8.8574
2009-07-01	3.6789
2009-10-01	-0.2025
2010-01-01	1.0354
2010-04-01	1.1099
2010-07-01	9.2973
2010-10-01	11.2661
2011-01-01	15.4172
2011-04-01	9.1767
2011-07-01	0.0703
2011-10-01	6.3285
2012-01-01	7.9218
2012-04-01	6.8871
2012-07-01	29.7017
2012-10-01	21.1902
2013-01-01	16.5075
2013-04-01	13.9104
2013-07-01	13.4829
2013-10-01	14.6561
2014-01-01	8.7454
2014-04-01	18.1205
2014-07-01	16.3959
2014-10-01	36.5209
2015-01-01	3.5247
2015-04-01	12.5419