Quarter	Billions of US Dollars
1988-01-01	0.07520
1988-07-01	0.26820
1989-01-01	0.45600
1989-07-01	0.44080
1990-01-01	0.29120
1993-04-01	-0.10000
1994-01-01	-0.09427
1994-07-01	-0.04975
1995-01-01	-0.33778
1995-07-01	-0.44839
1995-10-01	0.03335
1996-01-01	-0.00465
1996-04-01	0.02130
1996-07-01	-0.99335
1996-10-01	-0.01500
1997-04-01	0.03500
1997-10-01	0.13550
1998-01-01	0.15447
1998-07-01	-0.04272
2000-07-01	-0.20000
2002-10-01	0.12500
2003-04-01	0.32500
2003-10-01	1.03000
2004-01-01	0.12500
2004-04-01	0.15000
2004-07-01	0.55000
2004-10-01	-0.02500
2005-01-01	1.30000
2005-04-01	0.20000
2005-07-01	0.70000
2005-10-01	0.07500
2006-01-01	0.05060
2006-04-01	1.02500
2006-07-01	1.18289
2006-10-01	0.81283
2007-01-01	2.54585
2007-04-01	2.24977
2007-07-01	0.34048
2007-10-01	0.03480
2008-01-01	-0.08043
2008-04-01	0.72818
2008-07-01	0.63797
2008-10-01	-0.22067
2009-04-01	-0.30000
2009-07-01	-0.52622
2009-10-01	-0.40000
2010-01-01	-2.48188
2010-04-01	-1.47500
2010-07-01	1.22837
2010-10-01	0.76546
2011-01-01	0.33936
2011-04-01	0.10538
2011-07-01	-1.76808
2011-10-01	0.49964
2012-01-01	0.50477
2012-04-01	2.51983
2012-07-01	9.38070
2012-10-01	8.41000
2013-01-01	2.65662
2013-04-01	1.11800
2013-07-01	-0.80477
2013-10-01	1.67505
2014-01-01	1.98606
2014-04-01	0.21323
2014-07-01	1.79359
2014-10-01	-0.30813
2015-01-01	0.07725
2015-04-01	-0.18993