Quarter	Billions of US Dollars
1997-07-01	0.11500
2002-07-01	-0.11500
2005-10-01	0.15000
2008-04-01	0.03500
2010-10-01	-0.15000
2011-07-01	0.15000
2012-10-01	0.90000
2013-07-01	0.10000
2014-04-01	0.36877
2014-10-01	0.40000
2015-01-01	0.12500
2015-04-01	0.15000