Quarter	Billions of US Dollars
1985-01-01	0.01920
1986-07-01	0.02590
1988-04-01	0.04010
1990-01-01	-0.03381
1991-07-01	-0.03135
1994-04-01	0.01350
1994-10-01	0.03000
1996-04-01	-0.01350
1996-07-01	0.01350
1997-04-01	-0.01350
1997-10-01	0.00000
1998-04-01	-0.03683
1999-10-01	-0.03000
2000-04-01	0.10000
2001-10-01	0.15000
2005-01-01	0.20000
2005-10-01	0.12500
2006-04-01	0.15000
2006-10-01	0.06500
2008-01-01	0.32147
2009-10-01	0.45000
2010-01-01	-0.20000
2010-04-01	0.09000
2010-07-01	0.20000
2011-07-01	-0.16091
2014-04-01	-0.45000
2014-10-01	-0.19000