Quarter	Billions of US Dollars
1973-04-01	0.04300
1978-04-01	0.02500
1980-01-01	0.03000
1982-04-01	0.04000
2001-04-01	1.50000
2005-07-01	1.25000
2007-01-01	0.75000
2007-07-01	1.05514
2008-04-01	0.06670
2009-10-01	0.30000
2010-04-01	1.50000
2013-04-01	2.70000
2013-07-01	1.00000
2015-04-01	1.63660