Quarter	Billions of US Dollars
1999-04-01	1.00000
2000-04-01	1.40000
2009-04-01	2.00000
2009-10-01	7.00000
2010-04-01	0.54980
2011-10-01	5.00000
2012-01-01	-1.00000
2012-07-01	4.00000
2014-04-01	-2.00000
2015-01-01	-3.50000
2015-04-01	-0.54945