Quarter	Billions of US Dollars
1978-07-01	0.02500
1983-07-01	-0.02500
1999-07-01	0.15000
2000-01-01	0.05000
2001-07-01	0.35350
2002-01-01	0.14000
2002-04-01	0.50000
2002-07-01	0.30000
2002-10-01	0.45150
2003-01-01	0.34850
2004-04-01	0.10000
2004-07-01	0.28645
2005-04-01	0.37500
2006-04-01	0.40000
2006-07-01	0.20000
2007-01-01	-0.05000
2009-07-01	-0.07500
2009-10-01	0.80000
2010-04-01	-0.14000
2010-07-01	0.02000
2011-01-01	0.65350
2011-07-01	-0.80350
2012-07-01	-0.02000
2012-10-01	0.80000
2014-07-01	0.80000
2015-04-01	0.30000