Quarter	Billions of US Dollars
1993-07-01	0.22000
1993-10-01	0.00400
1994-01-01	-0.02800
1994-04-01	-0.02000
1994-07-01	0.07800
1994-10-01	0.00800
1995-01-01	0.02500
1995-04-01	0.02800
1995-07-01	-0.01737
1995-10-01	-0.00382
1996-01-01	0.10939
1996-04-01	-0.11742
1996-07-01	0.03269
1996-10-01	-0.04062
1997-01-01	-0.00272
1997-04-01	-0.02181
1997-07-01	-0.02668
1997-10-01	-0.00923
1998-01-01	-0.04762
1998-04-01	-0.01981
1998-07-01	0.05600
1998-10-01	0.00505
1999-01-01	0.13355
1999-04-01	0.05853
1999-07-01	0.23166
1999-10-01	0.14096
2000-01-01	-0.10059
2000-04-01	0.23395
2000-07-01	0.10843
2000-10-01	-0.09809
2001-01-01	0.10525
2001-04-01	-0.15674
2001-07-01	0.01487
2001-10-01	0.07912
2002-01-01	-0.37975
2002-04-01	-0.13963
2002-07-01	0.28081
2002-10-01	0.12717
2003-01-01	0.18621
2003-04-01	0.39658
2003-07-01	-0.03226
2003-10-01	0.25186
2004-01-01	0.00358
2004-04-01	0.21414
2004-07-01	0.10467
2004-10-01	-0.01539
2005-01-01	-0.56714
2005-04-01	0.44257
2005-07-01	-0.27137
2005-10-01	0.59279
2006-01-01	-0.15706
2006-04-01	-0.69319
2006-07-01	0.47529
2006-10-01	0.47403
2007-01-01	-0.14477
2007-04-01	0.26656
2007-07-01	-0.39272
2007-10-01	-0.07298
2008-01-01	0.30694
2008-04-01	-0.77360
2008-07-01	-0.10892
2008-10-01	-0.93905
2009-01-01	-0.36922
2009-04-01	-0.04799
2009-07-01	-0.09205
2009-10-01	0.04609
2010-04-01	-0.00107
2010-10-01	0.01528
2011-04-01	-0.06411