Quarter	Billions of US Dollars
1987-01-01	-0.05000
1996-01-01	0.07500
1996-10-01	0.10156
1997-01-01	0.15930
1997-04-01	0.23000
1997-07-01	0.87500
1997-10-01	0.90000
1998-01-01	0.05481
1998-10-01	-0.06014
1999-01-01	-0.07500
1999-04-01	-0.08903
1999-07-01	-0.20000
1999-10-01	-0.05000
2000-01-01	-0.10000
2000-07-01	-0.67500
2001-10-01	0.42907
2002-01-01	0.13646
2002-04-01	0.27000
2002-10-01	0.02500
2003-01-01	0.36364
2003-04-01	0.85000
2003-07-01	1.42401
2003-10-01	0.89863
2004-01-01	0.80000
2004-04-01	0.90000
2004-07-01	1.75000
2004-10-01	0.70000
2005-01-01	1.56852
2005-04-01	3.28894
2005-07-01	3.38210
2005-10-01	2.69673
2006-01-01	1.48245
2006-04-01	0.99063
2006-07-01	3.36627
2006-10-01	5.80380
2007-01-01	4.72884
2007-04-01	6.44559
2007-07-01	2.65047
2007-10-01	6.83408
2008-01-01	0.05607
2008-04-01	2.05441
2008-07-01	-0.60842
2008-10-01	-1.95803
2009-01-01	0.00973
2009-04-01	-0.10022
2009-07-01	2.11057
2009-10-01	0.99239
2010-01-01	0.69127
2010-04-01	-0.21747
2010-07-01	-1.50062
2010-10-01	4.09300
2011-01-01	-0.18465
2011-04-01	0.50496
2011-07-01	0.04997
2011-10-01	-0.14659
2012-01-01	-0.13257
2012-04-01	-0.20639
2012-07-01	4.98417
2012-10-01	4.17120
2013-01-01	2.36982
2013-04-01	5.57577
2013-07-01	0.44990
2013-10-01	0.78468
2014-01-01	-1.89154
2014-04-01	-0.79494
2014-07-01	-4.53590
2014-10-01	-0.67087
2015-01-01	-1.98578
2015-04-01	-2.50247