Quarter	Billions of US Dollars
1987-01-01	0.0267
1987-04-01	0.2336
1987-07-01	0.0846
1987-10-01	-0.1127
1988-01-01	0.3133
1988-04-01	0.1955
1988-07-01	0.1444
1988-10-01	-0.1548
1989-01-01	0.0422
1989-04-01	0.2277
1989-07-01	0.0207
1989-10-01	-0.0335
1990-01-01	0.0820
1990-04-01	0.2799
1990-07-01	0.1519
1990-10-01	-0.0217
1991-01-01	0.2042
1991-04-01	-0.2817
1991-07-01	0.1940
1991-10-01	0.1373
1992-01-01	0.6082
1992-04-01	-0.1617
1992-07-01	0.3049
1993-01-01	-0.4434
1993-04-01	-0.2794
1993-07-01	1.5760
1993-10-01	0.9383
1994-01-01	-0.3934
1994-04-01	0.0821
1994-07-01	0.1069
1994-10-01	-0.7147
1995-01-01	-1.0121
1995-04-01	-0.0921
1995-07-01	-0.0834
1995-10-01	0.6008
1996-01-01	-0.6308
1996-04-01	-0.1332
1996-07-01	-0.1881
1996-10-01	0.5596
1997-01-01	-0.2695
1997-04-01	0.8008
1997-07-01	0.1581
1997-10-01	-0.2357
1998-01-01	-0.3336
1998-04-01	1.7511
1998-07-01	0.6830
1998-10-01	0.9028
1999-01-01	1.2585
1999-04-01	5.0414
1999-07-01	0.7165
1999-10-01	4.0164
2000-01-01	4.4415
2000-04-01	4.2541
2000-07-01	3.3510
2000-10-01	3.6505
2001-01-01	0.3500
2001-04-01	2.8082
2001-07-01	2.6071
2001-10-01	1.0127
2002-01-01	0.3699
2002-04-01	2.1907
2002-07-01	1.5371
2002-10-01	0.2631
2003-01-01	0.4238
2003-04-01	3.1898
2003-07-01	0.3323
2003-10-01	6.1249
2004-01-01	7.0546
2004-04-01	8.0348
2004-07-01	12.5024
2004-10-01	14.6708
2005-01-01	22.3913
2005-04-01	13.8000
2005-07-01	-8.9443
2005-10-01	20.8501
2006-01-01	21.1849
2006-04-01	12.1339
2006-07-01	18.7739
2006-10-01	22.3535
2007-01-01	22.1102
2007-04-01	21.5365
2007-07-01	0.6900
2007-10-01	8.0165
2008-01-01	21.0393
2008-04-01	30.5062
2008-07-01	0.9844
2008-10-01	19.5034
2009-01-01	10.5986
2009-04-01	7.2991
2009-07-01	1.7633
2009-10-01	8.7702
2010-01-01	-6.2993
2010-04-01	-6.1054
2010-07-01	18.0030
2010-10-01	1.3174
2011-01-01	19.7799
2011-04-01	8.6129
2011-07-01	9.2407
2011-10-01	-1.7579
2012-01-01	-7.8289
2012-04-01	-15.9940
2012-07-01	-0.7133
2012-10-01	-6.1057
2013-01-01	-17.6780
2013-04-01	-0.4420
2013-07-01	2.4987
2013-10-01	-1.4318
2014-01-01	-13.6584
2014-04-01	-7.0649
2014-07-01	-19.1739
2014-10-01	-1.5078
2015-01-01	-0.2336
2015-04-01	-5.6719