Quarter	Billions of US Dollars
1978-07-01	0.06160
1984-07-01	0.09000
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	0.97736
2006-10-01	0.45792
2007-04-01	0.40000
2007-07-01	0.47500
2008-01-01	0.30456
2009-10-01	0.50000
2010-07-01	1.00000
2011-01-01	0.19657
2011-07-01	0.25011
2011-10-01	0.35000
2012-04-01	0.10323
2012-10-01	0.82113
2014-01-01	0.50000
2014-04-01	1.00000
2014-07-01	0.75000
2015-01-01	0.78200
2015-04-01	0.21750