Quarter	Billions of US Dollars
1997-01-01	4.87053
1998-10-01	-0.74012
2002-01-01	0.73957
2002-04-01	-0.01820
2002-10-01	-0.41805
2003-01-01	0.73180
2003-07-01	-0.03641
2003-10-01	-0.41029
2004-04-01	0.50000
2004-10-01	0.80565
2005-01-01	0.33333
2005-07-01	0.75000
2005-10-01	0.50000
2006-01-01	-0.10000
2007-01-01	1.41713
2007-04-01	-0.10166
2007-07-01	0.52148
2008-01-01	-1.44176
2009-01-01	1.00000
2009-07-01	1.00000
2010-04-01	0.57186
2010-10-01	2.50561
2012-01-01	1.08722
2014-10-01	2.93976
2015-01-01	0.82346