Quarter	Billions of US Dollars
1994-07-01	0.25510
1999-07-01	-0.09440
2000-01-01	0.16877
2000-07-01	-0.15330
2003-07-01	-1.12401
2004-01-01	-0.00683
2004-04-01	0.24423
2006-07-01	-0.15288
2011-04-01	-0.28785
2013-07-01	0.97096
2015-01-01	0.56893