Quarter	Billions of US Dollars
1987-10-01	-0.01000
1988-07-01	-0.02724
1994-01-01	0.27780
1995-01-01	0.25250
1995-04-01	0.14290
1995-07-01	0.14420
1996-07-01	0.13718
1997-07-01	0.48584
1999-07-01	0.11426
2000-01-01	-0.23351
2000-04-01	-0.11256
2000-07-01	0.46308
2000-10-01	-0.04553
2001-01-01	0.46194
2002-04-01	0.65000
2003-01-01	0.35697
2004-01-01	-0.27978
2004-04-01	0.54183
2005-04-01	0.62947
2005-07-01	-0.13485
2006-01-01	-0.29944
2006-04-01	-0.09105
2007-07-01	0.00194
2008-10-01	-0.03632
2009-07-01	-0.15589
2010-07-01	-0.40766
2011-04-01	-0.64766
2011-07-01	-0.19276
2012-04-01	-0.15000
2012-07-01	0.48500
2012-10-01	0.30335
2013-01-01	-0.43565
2013-07-01	0.45759
2014-10-01	0.45865