Quarter	Billions of US Dollars
1999-07-01	0.03287
2002-04-01	0.11390
2004-04-01	0.11987
2004-07-01	-0.03788
2006-07-01	-0.29303
2006-10-01	0.19170
2007-07-01	0.40713
2009-10-01	0.37615
2011-01-01	0.20079
2012-04-01	0.39331
2012-10-01	1.21863
2014-04-01	-0.54847
2014-10-01	0.04434
2015-04-01	0.03204