Quarter	Billions of US Dollars
1978-07-01	0.06160
1984-07-01	0.05000
2002-01-01	0.45000
2002-04-01	0.30000
2003-10-01	0.20000
2004-10-01	0.50000
2005-04-01	0.50000
2006-01-01	0.01934
2006-04-01	0.50236
2006-10-01	0.10000
2007-04-01	0.20000
2008-01-01	0.30456
2010-07-01	0.40000
2011-01-01	0.19657
2011-07-01	0.25011
2012-04-01	0.10323
2014-07-01	0.75000
2015-01-01	0.70000
2015-04-01	0.16200