Quarter	Billions of US Dollars
1987-04-01	-0.07634
1987-07-01	-0.08262
1987-10-01	-0.22860
1988-01-01	-0.15450
1988-04-01	0.03087
1988-07-01	0.11923
1988-10-01	-0.00112
1989-01-01	-0.03273
1989-04-01	-0.02787
1989-07-01	-0.02750
1990-01-01	-0.02525
1990-10-01	-0.13500
1992-01-01	0.12390
1992-07-01	-0.18669
1993-04-01	-0.50000
1993-07-01	-0.08941
1994-04-01	-0.09027
1994-07-01	0.01000
1994-10-01	0.01000
1995-04-01	-0.16197
1995-07-01	-0.10047
1995-10-01	-0.08936
1996-01-01	0.00800
1996-04-01	-0.01000
1996-07-01	0.00800
1996-10-01	0.00710
1997-01-01	-0.00900
1997-04-01	0.02000
1997-07-01	0.02425
1997-10-01	-0.08414
1998-01-01	0.09389
1998-04-01	0.00126
1998-07-01	-0.01892
1998-10-01	0.00120
1999-01-01	0.00117
1999-04-01	0.00120
1999-07-01	0.00924
1999-10-01	-0.00373
2000-01-01	0.00127
2000-04-01	0.00121
2000-07-01	-0.00178
2000-10-01	0.00116
2001-01-01	0.00116
2001-04-01	0.00116
2001-07-01	0.00115
2001-10-01	0.00097
2002-01-01	0.45088
2002-04-01	0.00100
2002-07-01	0.23104
2002-10-01	0.00114
2003-01-01	0.00138
2003-04-01	0.00152
2003-07-01	0.00164
2003-10-01	0.20186
2004-01-01	0.80190
2004-04-01	0.25201
2004-07-01	0.00215
2004-10-01	0.18903
2005-01-01	1.22744
2005-04-01	0.90234
2005-07-01	1.20623
2005-10-01	3.12944
2006-01-01	1.34992
2006-04-01	3.66630
2006-07-01	1.08696
2006-10-01	5.32383
2007-01-01	4.57275
2007-04-01	0.58650
2007-07-01	0.55138
2007-10-01	-0.58182
2008-01-01	3.18256
2008-04-01	0.95676
2008-07-01	0.35436
2008-10-01	-3.92573
2009-01-01	-1.69898
2009-04-01	-0.46129
2009-07-01	1.42208
2009-10-01	-0.52887
2010-01-01	-0.84635
2010-04-01	-1.23348
2010-07-01	-0.26935
2010-10-01	-0.88001
2011-01-01	1.41226
2011-04-01	-1.08603
2011-07-01	0.25412
2011-10-01	-0.16001
2012-01-01	-0.49402
2012-04-01	0.82308
2012-07-01	0.60863
2012-10-01	4.90736
2013-01-01	2.09528
2013-04-01	5.37075
2013-07-01	1.08157
2013-10-01	2.40901
2014-01-01	1.06558
2014-04-01	4.42804
2014-07-01	2.82821
2014-10-01	3.97445
2015-01-01	2.59377
2015-04-01	4.28622