Quarter	Billions of US Dollars
1987-01-01	0.22351
1987-04-01	0.15963
1987-07-01	-0.07944
1987-10-01	-0.02969
1988-01-01	0.39455
1988-04-01	0.24933
1988-07-01	0.07611
1988-10-01	0.08180
1989-01-01	0.05874
1989-04-01	0.13533
1989-07-01	0.12292
1989-10-01	0.05582
1990-01-01	-0.14529
1990-04-01	-0.08349
1990-07-01	0.01386
1990-10-01	0.08732
1991-01-01	0.37884
1991-04-01	-0.07603
1991-07-01	0.14743
1991-10-01	-0.17565
1992-01-01	0.15970
1992-04-01	-0.15236
1992-07-01	0.06889
1992-10-01	-0.26272
1993-01-01	0.20424
1993-04-01	-0.06229
1993-07-01	-0.06492
1993-10-01	-0.38152
1994-01-01	0.49230
1994-04-01	0.19614
1994-07-01	-0.00832
1994-10-01	-0.61519
1995-01-01	0.20911
1995-04-01	-0.15285
1995-07-01	0.48990
1995-10-01	-0.03669
1996-01-01	0.77564
1996-04-01	-0.11909
1996-07-01	0.15286
1996-10-01	-0.33297
1997-01-01	1.91508
1997-04-01	0.82266
1997-07-01	0.06052
1997-10-01	-1.03458
1998-01-01	1.32592
1998-04-01	0.83635
1998-07-01	0.43336
1998-10-01	-1.19639
1999-01-01	0.23666
1999-04-01	0.09994
1999-07-01	-0.43703
1999-10-01	-0.68736
2000-01-01	1.36559
2000-04-01	0.76942
2000-07-01	-0.14332
2000-10-01	-0.44577
2001-01-01	0.67772
2001-04-01	0.89046
2001-07-01	-0.43448
2001-10-01	-0.74471
2002-01-01	0.62095
2002-04-01	0.99391
2002-07-01	-0.43801
2002-10-01	0.61762
2003-01-01	0.72316
2003-04-01	1.24522
2003-07-01	-0.59134
2003-10-01	0.79788
2004-01-01	0.08018
2004-04-01	1.30209
2004-07-01	-0.02975
2004-10-01	0.86185
2005-01-01	0.42764
2005-04-01	0.86912
2005-07-01	0.63428
2005-10-01	0.68749
2006-01-01	0.81434
2006-04-01	1.92378
2006-07-01	0.57789
2006-10-01	1.57427
2007-01-01	1.98041
2007-04-01	0.65151
2007-07-01	4.31866
2007-10-01	0.35537
2008-01-01	1.69802
2008-04-01	3.40726
2008-07-01	0.99288
2008-10-01	-1.63135
2009-01-01	-0.48323
2009-04-01	-1.81887
2009-07-01	-1.49915
2009-10-01	1.51451
2010-01-01	1.49720
2010-04-01	-1.63207
2010-07-01	-0.88753
2010-10-01	-0.38172
2011-01-01	1.03104
2011-04-01	-0.78169
2011-07-01	-0.02958
2011-10-01	-1.88540
2012-01-01	-2.55943
2012-04-01	-1.31121
2012-07-01	-0.74713
2012-10-01	-0.81340
2013-01-01	-1.93860
2013-04-01	-4.75858
2013-07-01	-0.92378
2013-10-01	-1.27221
2014-01-01	-0.68420
2014-04-01	-0.27804
2014-07-01	-1.17969
2014-10-01	-1.99644
2015-01-01	-0.50909
2015-04-01	-0.52217