Quarter	Billions of US Dollars
1993-07-01	0.19378
1993-10-01	-0.34073
1994-01-01	0.17307
1994-04-01	0.10298
1994-07-01	0.00831
1994-10-01	-0.28977
1995-01-01	0.33400
1995-04-01	-0.09115
1995-07-01	0.14761
1995-10-01	-0.32667
1996-01-01	0.74998
1996-04-01	-0.00081
1996-07-01	-0.06500
1996-10-01	-0.40703
1997-01-01	1.37047
1997-04-01	0.34183
1997-07-01	-0.30250
1997-10-01	-1.01575
1998-01-01	0.92907
1998-04-01	0.52354
1998-07-01	0.46926
1998-10-01	-1.16269
1999-01-01	0.66091
1999-04-01	-0.16987
1999-07-01	-0.05776
1999-10-01	-1.18589
2000-01-01	1.60952
2000-04-01	0.43351
2000-07-01	2.24107
2000-10-01	-1.02973
2001-01-01	-0.23678
2001-04-01	0.00553
2001-07-01	-1.38014
2001-10-01	-1.04171
2002-01-01	0.40464
2002-04-01	0.14646
2002-07-01	0.00578
2002-10-01	0.08856
2003-01-01	0.10598
2003-04-01	0.80722
2003-07-01	-1.41592
2003-10-01	0.62716
2004-01-01	-0.34153
2004-04-01	-0.29316
2004-07-01	-0.06557
2004-10-01	2.38981
2005-01-01	-1.11291
2005-04-01	0.55719
2005-07-01	-0.24044
2005-10-01	-0.20521
2006-01-01	1.10014
2006-04-01	0.37903
2006-07-01	-0.02806
2006-10-01	-0.90255
2007-01-01	2.21509
2007-04-01	-0.34329
2007-07-01	1.44146
2007-10-01	3.90233
2008-01-01	5.61503
2008-04-01	-3.48591
2008-07-01	-1.08803
2008-10-01	2.63144
2009-01-01	-0.67252
2009-04-01	-3.00786
2009-07-01	-0.58462
2009-10-01	-3.01815
2010-01-01	4.35575
2010-04-01	-3.38801
2010-07-01	0.50664
2010-10-01	-4.15545
2011-01-01	4.07980
2011-04-01	-0.69334
2011-07-01	-0.62197
2011-10-01	6.67395
2012-01-01	3.27376
2012-04-01	0.47782
2012-07-01	1.98784
2012-10-01	-7.67231
2013-01-01	-5.90366
2013-04-01	-0.51787
2013-07-01	-0.04129
2013-10-01	2.84591
2014-01-01	0.42391
2014-04-01	-3.41542
2014-07-01	0.27149
2014-10-01	-1.26611
2015-01-01	-1.06104
2015-04-01	0.79344