Quarter	Billions of US Dollars
1993-07-01	0.22750
1993-10-01	0.01906
1994-01-01	-0.09119
1994-04-01	0.41157
1994-07-01	-0.18252
1994-10-01	0.22886
1995-01-01	-0.25023
1995-04-01	0.25362
1995-07-01	0.46926
1995-10-01	0.98711
1996-01-01	0.54631
1996-04-01	0.41631
1996-07-01	0.16285
1996-10-01	0.25140
1997-01-01	-0.28095
1997-04-01	-0.27233
1997-07-01	0.98145
1997-10-01	-0.29087
1998-01-01	2.59008
1998-04-01	0.21194
1998-07-01	-2.15397
1998-10-01	-0.99290
1999-01-01	-1.72204
1999-04-01	0.50695
1999-07-01	0.07690
1999-10-01	0.20993
2000-01-01	0.07684
2000-04-01	0.39852
2000-07-01	-0.50747
2000-10-01	-0.75701
2001-01-01	0.01749
2001-04-01	0.12392
2001-07-01	-0.52135
2001-10-01	0.29976
2002-01-01	-0.23073
2002-04-01	-0.52502
2002-07-01	-0.36732
2002-10-01	0.20542
2003-01-01	1.88178
2003-04-01	0.38894
2003-07-01	0.51191
2003-10-01	-1.49990
2004-01-01	-0.67417
2004-04-01	-0.65392
2004-07-01	-0.26268
2004-10-01	0.08750
2005-01-01	0.00602
2005-04-01	0.03883
2005-07-01	-0.05257
2005-10-01	0.06880
2006-01-01	0.03862
2006-04-01	0.34631
2006-07-01	-0.20947
2006-10-01	-0.02518
2007-01-01	-0.22137
2007-04-01	0.72133
2007-07-01	-0.76083
2007-10-01	0.82407
2008-01-01	-0.14626
2008-04-01	0.48490
2008-07-01	0.23081
2008-10-01	-0.85302
2009-01-01	-0.01682
2009-04-01	-0.35936
2009-07-01	0.43730
2009-10-01	-0.21710
2010-01-01	0.02283
2010-04-01	-0.02280
2010-07-01	0.39688
2010-10-01	0.24628
2011-01-01	0.16727
2011-04-01	-0.19131
2011-07-01	-0.62664
2011-10-01	-0.15947
2012-01-01	0.31977
2012-04-01	0.07667
2012-07-01	0.24260
2012-10-01	0.87823
2013-01-01	0.22483
2013-04-01	-0.52651
2013-07-01	-0.80269
2013-10-01	-0.37786
2014-01-01	-0.42545
2014-04-01	-0.28149
2014-07-01	0.10259
2014-10-01	-0.20341
2015-01-01	-0.06844
2015-04-01	0.03617