Quarter	Billions of US Dollars
2001-07-01	0.08900
2001-10-01	0.00001
2002-01-01	-0.01227
2002-04-01	-0.00331
2002-07-01	-0.07204
2002-10-01	0.05883
2003-01-01	-0.00900
2003-04-01	-0.00900
2003-10-01	-0.05943
2004-01-01	0.30000
2004-07-01	-0.30000
2005-01-01	0.00956
2006-01-01	-0.00956
2007-04-01	0.20600
2008-04-01	-0.20600