Quarter	Billions of US Dollars
2001-07-01	1.50000
2005-07-01	1.25000
2006-07-01	-0.50000
2007-07-01	1.05514
2010-04-01	1.50000
2011-07-01	-1.00000
2012-07-01	-0.98943
2013-04-01	2.70000
2013-07-01	1.00000
2014-10-01	-2.70000
2015-04-01	1.63660