Quarter	Billions of US Dollars
1987-04-01	-0.02700
1988-01-01	-0.42765
1988-04-01	-0.04500
1989-01-01	-0.10949
1989-04-01	-0.05000
1989-10-01	0.07561
1990-01-01	-0.00199
1990-04-01	-0.22345
1990-07-01	0.02239
1990-10-01	-0.00360
1991-01-01	0.56852
1991-04-01	1.06460
1991-07-01	0.05000
1991-10-01	0.07582
1992-01-01	0.49794
1992-04-01	0.16350
1992-07-01	0.35000
1992-10-01	-0.00216
1993-01-01	0.33411
1993-04-01	0.41141
1993-07-01	0.30787
1993-10-01	0.22925
1994-01-01	0.18162
1994-04-01	1.01202
1994-07-01	0.61081
1994-10-01	0.27354
1995-01-01	1.58651
1995-04-01	1.55501
1995-07-01	1.69552
1995-10-01	1.50514
1996-01-01	1.29024
1996-04-01	2.03417
1996-07-01	4.20985
1996-10-01	3.85522
1997-01-01	2.03660
1997-04-01	0.98812
1997-07-01	2.05558
1997-10-01	-0.72232
1998-01-01	-0.81690
1998-04-01	-0.27635
1998-07-01	-0.75324
1998-10-01	-0.56206
1999-01-01	-0.84833
1999-04-01	-1.24742
1999-07-01	-1.46263
1999-10-01	0.50075
2000-01-01	1.07673
2000-04-01	-0.52038
2000-07-01	-0.94270
2000-10-01	-1.37552
2001-01-01	-0.92969
2001-04-01	-1.27764
2001-07-01	-2.20448
2001-10-01	-0.10449
2002-01-01	-2.46692
2002-04-01	0.17115
2002-07-01	0.14860
2002-10-01	0.41674
2003-01-01	0.68883
2003-04-01	1.76388
2003-07-01	2.64173
2003-10-01	0.61844
2004-01-01	3.80998
2004-04-01	0.70681
2004-07-01	0.80596
2004-10-01	1.53741
2005-01-01	2.31537
2005-04-01	0.51286
2005-07-01	0.71722
2005-10-01	2.45030
2006-01-01	0.87833
2006-04-01	3.46785
2006-07-01	2.52305
2006-10-01	0.88974
2007-01-01	1.40535
2007-04-01	6.40418
2007-07-01	1.54352
2007-10-01	2.27461
2008-01-01	2.54571
2008-04-01	3.03477
2008-07-01	-1.65480
2008-10-01	-5.97327
2009-01-01	2.69321
2009-04-01	6.84089
2009-07-01	2.93401
2009-10-01	-2.41836
2010-01-01	2.44849
2010-04-01	1.15155
2010-07-01	3.65741
2010-10-01	-0.61835
2011-01-01	3.39164
2011-04-01	0.64310
2011-07-01	3.96002
2011-10-01	4.86448
2012-01-01	5.23648
2012-04-01	-0.51259
2012-07-01	6.65265
2012-10-01	-3.54086
2013-01-01	1.74315
2013-04-01	-2.70372
2013-07-01	9.43486
2013-10-01	5.20230
2014-01-01	1.06223
2014-04-01	-0.80051
2014-07-01	0.25666
2014-10-01	3.98960
2015-01-01	-1.13682
2015-04-01	3.34266