Quarter	Billions of US Dollars
1987-01-01	0.4467
1987-04-01	0.0901
1987-07-01	0.0285
1987-10-01	-0.1253
1988-01-01	0.0778
1988-04-01	0.3442
1988-07-01	-0.0576
1988-10-01	0.0130
1989-01-01	-0.1472
1989-04-01	-0.0392
1989-07-01	0.1808
1989-10-01	-0.4263
1990-01-01	0.0930
1990-04-01	-0.0560
1990-07-01	-0.0116
1990-10-01	-0.1911
1991-01-01	0.5429
1991-04-01	0.1955
1991-07-01	0.5749
1991-10-01	1.0283
1992-01-01	0.6335
1992-04-01	1.6313
1992-07-01	0.7027
1992-10-01	1.2840
1993-01-01	0.8900
1993-04-01	1.7783
1993-07-01	2.1877
1993-10-01	2.4183
1994-01-01	3.0111
1994-04-01	1.0620
1994-07-01	4.5651
1994-10-01	2.6016
1995-01-01	2.0612
1995-04-01	2.2367
1995-07-01	2.2462
1995-10-01	2.5469
1996-01-01	4.9601
1996-04-01	6.4540
1996-07-01	2.4677
1996-10-01	3.7461
1997-01-01	4.4023
1997-04-01	2.9714
1997-07-01	3.4274
1997-10-01	2.1129
1998-01-01	4.6724
1998-04-01	2.6196
1998-07-01	7.1996
1998-10-01	7.1606
1999-01-01	9.1911
1999-04-01	8.3093
1999-07-01	9.2691
1999-10-01	1.2416
2000-01-01	6.9248
2000-04-01	6.2946
2000-07-01	1.5203
2000-10-01	5.3035
2001-01-01	7.9656
2001-04-01	6.9430
2001-07-01	0.5054
2001-10-01	5.7415
2002-01-01	7.2840
2002-04-01	10.3440
2002-07-01	4.6927
2002-10-01	6.7175
2003-01-01	16.0230
2003-04-01	12.3109
2003-07-01	9.1433
2003-10-01	11.1322
2004-01-01	13.7321
2004-04-01	12.1798
2004-07-01	7.0171
2004-10-01	12.7180
2005-01-01	20.0890
2005-04-01	9.8489
2005-07-01	3.3077
2005-10-01	4.9781
2006-01-01	18.1961
2006-04-01	15.2620
2006-07-01	7.7442
2006-10-01	4.3504
2007-01-01	13.4487
2007-04-01	12.5169
2007-07-01	6.8027
2007-10-01	4.8121
2008-01-01	13.7322
2008-04-01	7.9250
2008-07-01	-9.9357
2008-10-01	0.3996
2009-01-01	16.0277
2009-04-01	37.8336
2009-07-01	6.7381
2009-10-01	10.7979
2010-01-01	39.1583
2010-04-01	-13.7811
2010-07-01	35.4570
2010-10-01	14.7021
2011-01-01	20.4447
2011-04-01	16.6833
2011-07-01	2.0633
2011-10-01	4.7162
2012-01-01	14.8020
2012-04-01	-1.2082
2012-07-01	9.9761
2012-10-01	-14.7329
2013-01-01	-10.0987
2013-04-01	10.5231
2013-07-01	9.5551
2013-10-01	-8.3130
2014-01-01	-11.2895
2014-04-01	-6.0717
2014-07-01	2.2366
2014-10-01	-4.7698
2015-01-01	6.6615
2015-04-01	-5.1396