Quarter	Billions of US Dollars
1978-01-01	0.02000
1980-04-01	0.05000
1980-07-01	0.01210
1980-10-01	0.04630
1985-01-01	-0.02000
1985-04-01	-0.05000
1985-10-01	-0.03991
1990-04-01	0.56499
1990-10-01	-0.01478
1994-01-01	0.05000
1996-10-01	-0.06661
1997-01-01	-0.05000
1998-04-01	0.20000
1998-10-01	-0.06718
1999-04-01	0.30000
2000-04-01	-0.00226
2000-07-01	0.25000
2000-10-01	-0.01039
2001-01-01	0.25000
2001-04-01	-0.01739
2001-10-01	-0.01039
2002-01-01	0.25000
2002-04-01	-0.01039
2002-10-01	-0.01039
2003-01-01	0.45000
2003-04-01	-0.35587
2003-10-01	0.04000
2004-01-01	0.09589
2008-01-01	-0.20000
2009-04-01	-0.30000
2011-01-01	-0.25000
2011-10-01	0.25000
2012-01-01	-0.25000
2012-04-01	0.25000
2012-10-01	1.00000
2013-01-01	-0.25000
2013-04-01	1.50000
2013-07-01	0.50000
2013-10-01	0.96000
2014-01-01	-0.31000
2014-04-01	1.00000
2015-01-01	1.00000