Quarter	Billions of US Dollars
1987-01-01	0.111
1987-04-01	0.405
1987-07-01	0.920
1987-10-01	0.329
1988-01-01	-0.041
1988-04-01	0.452
1988-07-01	0.581
1988-10-01	0.366
1989-01-01	0.948
1989-04-01	0.257
1989-07-01	0.441
1989-10-01	0.775
1990-01-01	0.538
1990-04-01	-0.171
1990-07-01	1.210
1990-10-01	0.402
1991-01-01	0.075
1991-04-01	-0.125
1991-07-01	0.412
1991-10-01	0.592
1992-01-01	0.988
1992-04-01	0.528
1992-07-01	1.120
1992-10-01	0.242
1993-01-01	-0.289
1993-04-01	-0.214
1993-07-01	2.087
1993-10-01	3.115
1994-01-01	0.710
1994-04-01	2.091
1994-07-01	0.956
1994-10-01	0.260
1995-01-01	0.565
1995-04-01	3.506
1995-07-01	2.035
1995-10-01	1.775
1996-01-01	5.842
1996-04-01	7.376
1996-07-01	4.071
1996-10-01	16.396
1997-01-01	5.690
1997-04-01	8.989
1997-07-01	16.250
1997-10-01	17.851
1998-01-01	5.761
1998-04-01	15.191
1998-07-01	9.885
1998-10-01	4.842
1999-01-01	10.226
1999-04-01	13.026
1999-07-01	9.295
1999-10-01	8.957
2000-01-01	9.716
2000-04-01	9.128
2000-07-01	15.394
2000-10-01	10.645
2001-01-01	15.067
2001-04-01	15.046
2001-07-01	12.110
2001-10-01	15.592
2002-01-01	6.317
2002-04-01	4.556
2002-07-01	8.287
2002-10-01	2.333
2003-01-01	-3.764
2003-04-01	-1.263
2003-07-01	3.003
2003-10-01	0.359
2004-01-01	7.254
2004-04-01	5.691
2004-07-01	5.696
2004-10-01	5.847
2005-01-01	5.862
2005-04-01	8.855
2005-07-01	13.978
2005-10-01	39.072
2006-01-01	48.083
2006-04-01	48.453
2006-07-01	71.494
2006-10-01	120.860
2007-01-01	102.083
2007-04-01	102.487
2007-07-01	52.264
2007-10-01	21.378
2008-01-01	-4.357
2008-04-01	4.731
2008-07-01	1.977
2008-10-01	-4.717
2009-01-01	-12.300
2009-04-01	5.093
2009-07-01	7.796
2009-10-01	2.079
2010-01-01	3.456
2010-04-01	-6.250
2010-07-01	5.789
2010-10-01	9.070
2011-01-01	1.001
2011-04-01	-9.366
2011-07-01	-2.016
2011-10-01	8.904
2012-01-01	11.542
2012-04-01	6.503
2012-07-01	8.579
2012-10-01	25.056
2013-01-01	9.043
2013-04-01	20.479
2013-07-01	2.952
2013-10-01	19.775
2014-01-01	12.243
2014-04-01	34.258
2014-07-01	19.700
2014-10-01	22.899
2015-01-01	15.151
2015-04-01	11.413