Quarter	Billions of US Dollars
1988-01-01	-0.03000
1988-07-01	-0.00703
1991-04-01	0.02800
1996-01-01	0.06200
1996-04-01	0.10000
1996-07-01	0.07000
1996-10-01	0.11000
1997-01-01	-0.03000
1997-04-01	1.08916
1997-07-01	0.19168
1997-10-01	0.05682
1998-01-01	0.00697
1998-04-01	0.00712
1998-07-01	0.00728
1998-10-01	0.00744
1999-01-01	0.43779
1999-04-01	0.00777
1999-07-01	0.03794
1999-10-01	0.03211
2000-01-01	0.01709
2000-04-01	-0.07433
2000-07-01	-0.07135
2000-10-01	0.43984
2001-01-01	0.15201
2001-04-01	0.15923
2001-07-01	0.05943
2001-10-01	0.15280
2002-01-01	0.00985
2002-04-01	2.10107
2002-07-01	0.45529
2002-10-01	1.15401
2003-01-01	0.01074
2003-04-01	0.01182
2003-07-01	0.14390
2003-10-01	1.14476
2004-01-01	1.75042
2004-04-01	0.17644
2004-07-01	1.52154
2004-10-01	1.85408
2005-01-01	0.23414
2005-04-01	0.87851
2005-07-01	0.97874
2005-10-01	0.01539
2006-01-01	1.30778
2006-04-01	0.01247
2006-07-01	0.44742
2006-10-01	1.24108
2007-01-01	0.37948
2007-04-01	-0.05163
2007-07-01	0.48882
2007-10-01	0.04378
2008-01-01	1.07993
2008-04-01	-0.32218
2008-07-01	0.19428
2008-10-01	-0.23237
2009-01-01	-0.05309
2009-04-01	-0.25879
2009-07-01	5.28506
2009-10-01	-1.03366
2010-01-01	0.66822
2010-04-01	0.83433
2010-07-01	2.34817
2010-10-01	0.60573
2011-01-01	0.07561
2011-04-01	-0.77216
2011-07-01	0.18160
2011-10-01	0.16267
2012-01-01	1.95633
2012-04-01	2.39388
2012-07-01	0.55592
2012-10-01	0.27217
2013-01-01	-1.02506
2013-04-01	3.06052
2013-07-01	-0.13528
2013-10-01	0.35112
2014-01-01	-0.24650
2014-04-01	-0.07551
2014-07-01	-1.19996
2014-10-01	1.17483
2015-01-01	4.09668
2015-04-01	-0.19602