Quarter	Billions of US Dollars
1993-07-01	0.15000
1993-10-01	-0.06000
1994-01-01	0.06000
1995-10-01	-0.15000
1997-01-01	0.07500
1997-04-01	-0.07082
1997-07-01	0.01576
1997-10-01	0.09140
1998-01-01	0.04485
1998-04-01	0.04708
1998-07-01	0.08491
1998-10-01	-0.02583
1999-01-01	-0.06001
1999-04-01	0.22205
1999-07-01	0.02225
1999-10-01	-0.00209
2000-01-01	-0.17376
2000-04-01	0.00818
2000-07-01	0.08138
2000-10-01	0.03585
2001-01-01	0.07031
2001-04-01	0.10129
2001-07-01	-0.04428
2001-10-01	0.03988
2002-01-01	-0.07134
2002-04-01	0.32744
2002-07-01	0.19835
2002-10-01	-0.11359
2003-01-01	-0.19552
2003-04-01	0.30811
2003-07-01	-0.13360
2003-10-01	-0.10369
2004-01-01	0.00374
2004-04-01	-0.11920
2004-07-01	0.72543
2004-10-01	0.74364
2005-01-01	2.37118
2005-04-01	-1.65551
2005-07-01	0.55711
2005-10-01	-0.18072
2006-01-01	-0.01523
2006-04-01	0.40849
2006-07-01	0.55151
2006-10-01	-0.27988
2007-01-01	-0.19610
2007-04-01	1.32240
2007-07-01	-0.88048
2007-10-01	-0.91300
2008-01-01	0.01459
2008-04-01	-0.58065
2008-07-01	0.53577
2008-10-01	-1.26641
2009-01-01	-0.04933
2009-04-01	0.13602
2009-07-01	0.04828
2009-10-01	-0.36323
2010-01-01	0.68781
2010-04-01	-0.48636
2010-07-01	0.75687
2010-10-01	-0.12717
2011-01-01	1.23021
2011-04-01	1.87638
2011-07-01	3.40250
2011-10-01	1.79476
2012-01-01	0.17078
2012-04-01	-0.99596
2012-07-01	-1.48456
2012-10-01	-0.98042
2013-01-01	2.34144
2013-04-01	4.90881
2013-07-01	8.11661
2013-10-01	2.29286
2014-01-01	0.54816
2014-04-01	1.53745
2014-07-01	1.12286
2014-10-01	-2.55345
2015-01-01	-4.00945
2015-04-01	1.46682