Quarter	Billions of US Dollars
1987-01-01	0.20000
1987-04-01	0.10395
1987-07-01	0.00110
1987-10-01	0.00121
1988-01-01	0.00129
1988-04-01	0.00133
1988-07-01	0.00126
1988-10-01	0.00136
1989-01-01	0.00134
1989-04-01	0.00126
1989-07-01	0.00124
1989-10-01	0.00124
1990-01-01	0.00122
1990-04-01	-0.02197
1990-07-01	0.00126
1990-10-01	0.00142
1991-01-01	0.00140
1991-04-01	0.00137
1991-07-01	0.00140
1991-10-01	0.00149
1992-01-01	0.00152
1992-04-01	-0.14501
1993-01-01	-0.05000
1993-07-01	0.19509
1993-10-01	0.09207
1994-01-01	-0.23709
1994-04-01	0.73198
1994-07-01	0.32317
1994-10-01	-0.11785
1995-01-01	0.31807
1995-04-01	-0.05251
1995-07-01	-0.03783
1995-10-01	-0.13543
1996-01-01	0.02085
1996-04-01	-0.39537
1996-07-01	-0.01423
1996-10-01	0.02484
1997-01-01	-0.06971
1997-04-01	0.22472
1997-07-01	-0.07542
1997-10-01	-0.03666
1998-01-01	0.05952
1998-04-01	-0.25284
1998-07-01	-0.02927
1998-10-01	-0.04039
1999-01-01	0.11995
1999-04-01	-0.29131
1999-07-01	0.08475
1999-10-01	-0.13514
2000-01-01	0.18942
2000-04-01	-0.11985
2000-07-01	-0.06368
2000-10-01	-0.04185
2001-01-01	-0.14061
2001-04-01	-0.03659
2001-07-01	0.00819
2001-10-01	0.05953
2002-01-01	-0.01169
2002-04-01	1.04442
2002-07-01	-0.35037
2002-10-01	0.00040
2003-01-01	1.19175
2003-04-01	0.07345
2003-07-01	-0.63845
2003-10-01	0.38578
2004-01-01	1.20064
2004-04-01	0.58093
2004-07-01	1.82396
2004-10-01	2.28579
2005-01-01	2.45270
2005-04-01	1.05519
2005-07-01	0.07687
2005-10-01	0.92922
2006-01-01	0.09275
2006-04-01	-0.23304
2006-07-01	-0.11720
2006-10-01	-1.38137
2007-01-01	-1.46559
2007-04-01	-0.06985
2007-07-01	0.74479
2007-10-01	0.52687
2008-01-01	1.51496
2008-04-01	-3.31570
2008-07-01	-1.33092
2008-10-01	-1.03944
2009-01-01	-1.10162
2009-04-01	-0.31172
2009-07-01	-2.29442
2009-10-01	1.66612
2010-01-01	-1.38003
2010-04-01	-0.75360
2010-07-01	-0.39851
2010-10-01	0.11086
2011-01-01	0.64718
2011-04-01	-0.22025
2011-07-01	0.17083
2011-10-01	-0.27393
2012-01-01	-0.12089
2012-04-01	0.14752
2012-07-01	0.12782
2012-10-01	-1.28036
2013-01-01	-0.33243
2013-04-01	0.21803
2013-07-01	0.13597
2013-10-01	1.22285
2014-01-01	0.37695
2014-04-01	-0.12328
2014-07-01	-0.43310
2014-10-01	-0.42782
2015-01-01	-0.29957
2015-04-01	-0.23056