Quarter	Billions of US Dollars
1993-07-01	0.21493
1994-04-01	-0.20000
1994-07-01	0.06000
1994-10-01	0.37909
1995-07-01	0.07500
1995-10-01	0.04311
1996-01-01	0.45000
1996-10-01	0.09456
1997-01-01	-0.16957
1997-07-01	0.30641
1997-10-01	-0.06980
1998-07-01	-0.17002
1998-10-01	-0.24855
1999-01-01	0.24440
1999-07-01	-0.15000
1999-10-01	-0.00637
2000-07-01	-0.15000
2000-10-01	-0.25731
2001-01-01	0.17000
2001-07-01	-0.34183
2001-10-01	-0.20000
2002-07-01	-0.34000
2002-10-01	-0.19364
2003-07-01	-0.43000
2003-10-01	-0.24000
2004-07-01	-0.25000
2004-10-01	-0.47300
2005-04-01	0.37182
2005-07-01	-0.25000
2005-10-01	-0.05280
2006-01-01	-0.45000
2006-04-01	0.44478
2006-10-01	-0.45000
2007-07-01	-0.45631
2008-01-01	0.47017
2009-01-01	-0.29474
2009-04-01	0.51976
2009-10-01	-0.24000
2011-01-01	-0.17000
2012-01-01	0.65000
2012-04-01	0.88000
2013-04-01	1.00000
2014-04-01	1.00000
2015-04-01	1.00000