Quarter	Billions of US Dollars
1997-01-01	0.35417
1997-07-01	1.63501
1998-01-01	0.09739
1998-10-01	-0.04839
1999-01-01	0.33285
1999-10-01	0.23551
2000-01-01	0.48220
2000-07-01	0.37576
2001-01-01	0.60068
2001-07-01	0.21163
2002-01-01	0.13230
2002-04-01	0.20064
2003-01-01	0.54106
2003-04-01	0.21542
2004-04-01	0.60496
2004-07-01	-0.18742
2004-10-01	-0.23610
2005-01-01	-0.65740
2006-01-01	-0.57447
2006-07-01	-0.60443
2007-07-01	-0.33963
2008-01-01	-0.65985
2008-04-01	-0.23921
2008-07-01	-0.04199
2009-01-01	-0.68989
2009-04-01	0.79320
2009-07-01	-0.03899
2009-10-01	1.50000
2010-01-01	-0.73111
2010-07-01	1.21101
2011-01-01	0.47517
2011-07-01	1.07335
2012-04-01	1.50000
2013-04-01	1.50000
2013-10-01	1.75000
2014-04-01	1.02569
2015-01-01	0.83343