Quarter	Billions of US Dollars
1997-01-01	0.35417
1997-04-01	0.05770
1997-07-01	1.63501
1998-01-01	0.09739
1998-10-01	-0.04839
1999-01-01	0.33285
1999-07-01	0.03287
1999-10-01	0.23551
2000-01-01	0.48220
2000-07-01	0.37576
2001-01-01	0.63918
2001-07-01	0.21163
2002-01-01	0.13230
2002-04-01	0.26782
2002-10-01	0.09967
2003-01-01	0.54106
2003-04-01	0.21542
2004-01-01	0.33661
2004-04-01	0.72483
2004-07-01	-0.22530
2004-10-01	-0.23610
2005-01-01	-0.65740
2006-01-01	-0.57447
2006-07-01	-0.70567
2006-10-01	0.19170
2007-04-01	0.33772
2007-07-01	0.06750
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	1.87615
2010-01-01	-0.73111
2010-07-01	1.21101
2011-01-01	0.26603
2011-07-01	1.07335
2012-04-01	1.89331
2012-10-01	1.08890
2013-04-01	1.50000
2013-07-01	0.19903
2013-10-01	1.75000
2014-04-01	0.47722
2015-01-01	0.83343