Quarter	Billions of US Dollars
1988-01-01	-0.01800
1989-04-01	-0.06000
1999-10-01	0.10000
2004-10-01	-0.10000
2005-07-01	1.55362
2006-01-01	0.37800
2006-10-01	0.15000
2007-01-01	0.75000
2008-04-01	0.06670
2010-04-01	-0.65000
2010-07-01	0.60000
2011-04-01	-2.18162
2012-10-01	-0.05894