Quarter	Billions of US Dollars
1998-04-01	0.11000
2005-04-01	-0.11000
2007-04-01	0.75000
2007-07-01	0.27543
2007-10-01	0.00064
2008-01-01	0.57564
2008-04-01	0.00064
2008-07-01	0.40065
2008-10-01	0.00065
2009-01-01	1.62565
2009-04-01	0.88663
2009-07-01	0.00065
2009-10-01	0.00065
2010-01-01	0.00065
2010-04-01	0.00596
2010-07-01	-0.28256
2011-01-01	0.30000
2011-04-01	0.30000
2011-07-01	0.18000
2011-10-01	0.02561
2012-04-01	-0.00129
2012-07-01	0.84500
2013-04-01	-0.75000
2013-07-01	0.86927
2014-04-01	-1.14126
2014-10-01	-0.02138
2015-01-01	-0.00398
2015-04-01	0.15000