Quarter	Billions of US Dollars
1997-01-01	0.00373
1997-04-01	0.00017
1997-07-01	0.00018
1997-10-01	0.00018
1998-01-01	-0.00426
2005-04-01	2.00000
2009-10-01	0.01310
2015-04-01	-2.00000