Quarter	Billions of US Dollars
1998-04-01	0.20
1999-04-01	0.30
2000-07-01	0.25
2001-01-01	0.25
2002-01-01	0.25
2003-01-01	0.45
2003-04-01	-0.20
2004-01-01	0.25
2008-01-01	-0.20
2009-04-01	-0.30
2011-01-01	-0.25
2012-01-01	-0.25
2012-10-01	1.00
2013-01-01	-0.25
2013-04-01	1.00
2014-01-01	-0.25
2014-04-01	1.00
2015-01-01	1.00