Quarter	Billions of US Dollars
1993-07-01	0.27500
1993-10-01	0.07900
1994-01-01	-0.05800
1994-04-01	-0.16144
1994-07-01	0.05300
1994-10-01	-0.07700
1995-01-01	0.02500
1995-04-01	0.06701
1995-07-01	-0.06237
1995-10-01	-0.00382
1996-01-01	0.10939
1996-04-01	-0.10242
1996-07-01	0.05469
1996-10-01	-0.04062
1997-01-01	-0.00272
1997-04-01	0.00819
1997-07-01	0.01770
1997-10-01	-0.12098
1998-01-01	-0.03062
1998-04-01	-0.01613
1998-07-01	0.06671
1998-10-01	0.05574
1999-01-01	0.07826
1999-04-01	0.21353
1999-07-01	0.23166
1999-10-01	-0.04753
2000-01-01	-0.10059
2000-04-01	0.23395
2000-07-01	0.20843
2000-10-01	-0.11809
2001-01-01	0.31366
2001-04-01	-0.13158
2001-07-01	-0.08632
2001-10-01	0.22136
2002-01-01	-0.56708
2002-04-01	0.32803
2002-07-01	0.16713
2002-10-01	0.62432
2003-01-01	0.30357
2003-04-01	-0.06806
2003-07-01	-0.43801
2003-10-01	0.30267
2004-01-01	0.28590
2004-04-01	0.27161
2004-07-01	-0.30848
2004-10-01	-0.11423
2005-01-01	0.38977
2005-04-01	0.10303
2005-07-01	-0.16371
2005-10-01	0.95431
2006-01-01	-0.51381
2006-04-01	-0.69345
2006-07-01	0.10404
2006-10-01	0.38520
2007-01-01	0.58554
2007-04-01	-0.20212
2007-07-01	-0.50499
2007-10-01	0.28947
2008-01-01	0.23560
2008-04-01	-1.35193
2008-07-01	-0.27339
2008-10-01	-0.98252
2009-01-01	-0.26979
2009-04-01	0.09671
2009-07-01	1.42941
2009-10-01	-0.22501
2010-01-01	0.58317
2010-04-01	0.51285
2010-07-01	-2.58742
2010-10-01	-0.20240
2011-01-01	0.04099
2011-04-01	-0.10729