Quarter	Billions of US Dollars
2002-07-01	0.30000
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	0.10000
2007-07-01	-0.20000
2008-01-01	0.30456
2009-10-01	-0.50000
2010-04-01	-0.50000
2010-07-01	0.40000
2011-01-01	0.17731
2011-04-01	-0.57570
2011-07-01	0.25011
2011-10-01	-0.10000
2012-04-01	0.00323
2012-07-01	-0.10000
2013-01-01	-0.19471
2015-04-01	0.70000