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	0.97736
2006-07-01	-0.12500
2006-10-01	0.35792
2007-04-01	0.30000
2007-07-01	0.27500
2008-01-01	0.30456
2008-10-01	-0.26418
2010-04-01	-0.50000
2010-07-01	0.90000
2011-01-01	0.17731
2011-04-01	-0.92570
2011-07-01	0.25011
2011-10-01	-0.10000
2012-04-01	0.00323
2012-07-01	-0.77500
2012-10-01	0.82113
2013-01-01	-0.19471
2014-01-01	0.50000
2014-04-01	0.50000
2015-01-01	0.08200
2015-04-01	0.75550