Quarter	Billions of US Dollars
1987-04-01	-0.0150
1987-07-01	-0.0700
1988-04-01	-0.0250
1988-07-01	-0.0600
1989-04-01	-0.0805
1990-07-01	-0.0800
1990-10-01	-0.0400
1995-10-01	-0.0888
1997-10-01	0.2750
1998-10-01	0.2500
1999-01-01	0.1500
1999-07-01	0.0600
2000-04-01	0.0700
2001-04-01	0.1000
2001-10-01	0.1200
2004-10-01	-0.1750
2005-01-01	-0.1500
2005-07-01	-0.0120
2005-10-01	0.1000
2006-01-01	-0.2375
2007-04-01	0.1500
2009-07-01	-0.0480
2010-04-01	-0.0700
2011-04-01	-0.1000
2011-10-01	-0.2200
2012-04-01	-0.1500
2012-10-01	-0.1125
2013-04-01	0.1500