Quarter	Billions of US Dollars
1999-04-01	0.15869
1999-10-01	0.07802
2001-10-01	0.18083
2004-04-01	0.22260
2008-01-01	0.60505
2008-10-01	-0.26418
2011-04-01	0.50000
2012-01-01	1.00000
2012-10-01	1.25000
2014-01-01	2.73935
2014-04-01	0.82270
2014-07-01	-1.30443
2014-10-01	0.01936
2015-04-01	-0.00044