Quarter	Billions of US Dollars
1987-04-01	0.02690
1988-04-01	0.07970
1988-07-01	0.15280
1988-10-01	0.18720
1989-01-01	0.09430
1989-04-01	0.18380
1989-07-01	0.46371
1989-10-01	-0.15270
1990-01-01	0.06232
1990-04-01	-0.09072
1990-10-01	-0.06460
1991-01-01	-0.06489
1991-04-01	-0.08704
1991-07-01	-0.16494
1991-10-01	-0.06610
1992-01-01	-0.10688
1992-04-01	-0.03792
1993-01-01	-0.10329
1993-04-01	-0.04000
1994-04-01	-0.07234
1994-07-01	-0.28757
1994-10-01	0.05000
1995-01-01	0.05000
1996-01-01	0.08100
1996-10-01	-0.07000
1997-01-01	0.05000
1998-04-01	0.02282
1998-07-01	0.09691
1998-10-01	-0.10945
1999-01-01	0.05110
1999-04-01	0.02350
1999-07-01	0.89011
1999-10-01	0.13866
2000-01-01	-0.25643
2000-04-01	0.61770
2000-07-01	0.12061
2000-10-01	-0.04500
2001-01-01	0.11826
2001-04-01	1.38685
2001-07-01	1.93739
2001-10-01	0.27362
2002-01-01	0.47048
2002-04-01	0.50816
2002-07-01	0.52420
2002-10-01	0.02007
2003-01-01	0.06870
2003-04-01	0.85201
2003-07-01	0.64954
2003-10-01	0.17573
2004-01-01	-0.09472
2004-04-01	1.08245
2004-07-01	1.90416
2004-10-01	2.27736
2005-01-01	2.83624
2005-04-01	-1.19662
2005-07-01	0.54994
2005-10-01	0.46906
2006-01-01	-0.28739
2006-04-01	1.92822
2006-07-01	0.68030
2006-10-01	0.15823
2007-01-01	0.88152
2007-04-01	3.21587
2007-07-01	-0.81407
2007-10-01	-0.81266
2008-01-01	-0.26305
2008-04-01	-0.46844
2008-07-01	0.59421
2008-10-01	-1.56733
2009-01-01	-0.95831
2009-04-01	-1.89395
2009-07-01	-1.18049
2009-10-01	-0.22780
2010-01-01	0.90750
2010-04-01	-1.01367
2010-07-01	2.16178
2010-10-01	0.27400
2011-01-01	1.98576
2011-04-01	2.33710
2011-07-01	1.45983
2011-10-01	2.18474
2012-01-01	6.98757
2012-04-01	-1.28454
2012-07-01	2.48511
2012-10-01	2.39624
2013-01-01	3.33525
2013-04-01	6.26013
2013-07-01	8.37439
2013-10-01	3.31125
2014-01-01	1.72472
2014-04-01	3.70253
2014-07-01	5.48598
2014-10-01	-3.54454
2015-01-01	-3.69100
2015-04-01	3.03375