Quarter	Billions of US Dollars
1987-01-01	0.3856
1987-04-01	0.3342
1987-07-01	-0.1106
1987-10-01	0.0721
1988-01-01	0.6166
1988-04-01	0.5645
1988-07-01	0.0068
1988-10-01	0.3416
1989-01-01	0.8137
1989-04-01	0.1047
1989-07-01	0.0299
1989-10-01	0.8982
1990-01-01	-0.0146
1990-04-01	0.4736
1990-07-01	0.1119
1990-10-01	0.2707
1991-01-01	0.1999
1991-04-01	-0.2497
1991-07-01	0.7049
1991-10-01	0.0445
1992-01-01	0.0451
1992-04-01	0.2779
1992-07-01	0.5566
1992-10-01	-0.2483
1993-01-01	-0.4368
1993-04-01	0.4287
1993-07-01	0.9316
1993-10-01	0.2931
1994-01-01	-0.3636
1994-04-01	-0.0205
1994-07-01	0.4228
1994-10-01	0.4860
1995-01-01	1.0231
1995-04-01	-0.3778
1995-07-01	0.8675
1995-10-01	1.0973
1996-01-01	1.4883
1996-04-01	0.7172
1996-07-01	0.5870
1996-10-01	0.8690
1997-01-01	1.9851
1997-04-01	0.4179
1997-07-01	1.5672
1997-10-01	0.8802
1998-01-01	1.5837
1998-04-01	1.2357
1998-07-01	-0.3892
1998-10-01	0.3681
1999-01-01	0.0346
1999-04-01	2.4663
1999-07-01	3.2724
1999-10-01	2.1345
2000-01-01	3.3281
2000-04-01	4.6814
2000-07-01	6.3969
2000-10-01	0.4562
2001-01-01	5.1985
2001-04-01	0.0853
2001-07-01	0.2008
2001-10-01	6.4922
2002-01-01	2.6805
2002-04-01	3.4405
2002-07-01	-0.6326
2002-10-01	0.0857
2003-01-01	0.8626
2003-04-01	1.0909
2003-07-01	2.1610
2003-10-01	0.1647
2004-01-01	6.6989
2004-04-01	0.7500
2004-07-01	2.4556
2004-10-01	1.4184
2005-01-01	6.5703
2005-04-01	4.0209
2005-07-01	0.6025
2005-10-01	6.2331
2006-01-01	5.9778
2006-04-01	6.8585
2006-07-01	0.2998
2006-10-01	8.6778
2007-01-01	15.4432
2007-04-01	3.2256
2007-07-01	0.9671
2007-10-01	7.9692
2008-01-01	4.1835
2008-04-01	0.9281
2008-07-01	4.0537
2008-10-01	3.2300
2009-01-01	3.5253
2009-04-01	1.4624
2009-07-01	2.0999
2009-10-01	-5.8438
2010-01-01	-2.2645
2010-04-01	-6.6613
2010-07-01	1.5723
2010-10-01	-4.4908
2011-01-01	1.8764
2011-04-01	-8.9041
2011-07-01	3.4726
2011-10-01	-7.2683
2012-01-01	-8.9079
2012-04-01	-5.9587
2012-07-01	-3.1221
2012-10-01	1.6469
2013-01-01	-6.2793
2013-04-01	1.5220
2013-07-01	-9.2133
2013-10-01	2.9916
2014-01-01	-10.2143
2014-04-01	-2.7860
2014-07-01	-2.5351
2014-10-01	-2.0835
2015-01-01	-3.0947
2015-04-01	-4.0555