Quarter	Billions of US Dollars
1987-04-01	0.2000
1987-07-01	0.0998
1987-10-01	0.2000
1988-01-01	0.1175
1988-07-01	0.1256
1988-10-01	0.1110
1989-04-01	0.1538
1989-10-01	0.1000
1991-07-01	0.1429
1992-04-01	-0.0629
1992-07-01	0.1489
1992-10-01	-0.0500
1993-04-01	0.0362
1993-07-01	0.3942
1993-10-01	0.0200
1994-01-01	0.5000
1994-04-01	0.1456
1994-07-01	0.3265
1994-10-01	0.1220
1995-01-01	0.1705
1995-04-01	-0.2369
1995-10-01	-0.2130
1996-01-01	0.2084
1996-04-01	-0.1859
1996-07-01	-0.3651
1997-01-01	0.4000
1997-04-01	0.6097
1997-07-01	-0.0572
1998-01-01	-0.0660
1998-04-01	-0.5438
1998-07-01	-0.4540
1998-10-01	-0.1252
1999-01-01	-0.4060
1999-04-01	0.5006
1999-07-01	-0.1608
1999-10-01	0.2052
2000-01-01	-0.1801
2000-04-01	0.0383
2000-07-01	-0.0700
2001-01-01	0.0192
2001-04-01	-0.1273
2001-07-01	0.0904
2001-10-01	0.3610
2002-01-01	1.0000
2002-04-01	-0.5407
2002-07-01	-0.2392
2002-10-01	-0.2772
2003-01-01	0.0256
2003-04-01	0.2508
2003-07-01	0.2221
2003-10-01	0.6845
2004-01-01	0.1410
2004-04-01	0.0525
2004-07-01	1.4658
2004-10-01	1.2951
2005-01-01	0.1514
2005-04-01	-0.1717
2005-07-01	1.0815
2005-10-01	1.2934
2006-01-01	-0.3336
2006-04-01	0.2750
2006-07-01	-0.2224
2006-10-01	-0.2647
2007-01-01	0.3874
2007-04-01	0.2918
2007-07-01	1.4570
2007-10-01	-0.5590
2008-01-01	0.2744
2008-04-01	0.5601
2008-07-01	1.4696
2008-10-01	-0.2437
2009-01-01	-0.0609
2009-04-01	-0.6398
2009-07-01	-0.4902
2009-10-01	0.2659
2010-01-01	1.9016
2010-04-01	0.4059
2010-07-01	-0.7140
2010-10-01	3.2855
2011-01-01	1.4152
2011-04-01	6.0118
2011-07-01	0.7453
2011-10-01	4.5607
2012-01-01	8.3622
2012-04-01	3.1363
2012-07-01	0.6894
2012-10-01	5.6611
2013-01-01	6.7844
2013-04-01	6.5556
2013-07-01	6.8191
2013-10-01	10.9239
2014-01-01	21.4408
2014-04-01	17.5410
2014-07-01	15.1439
2014-10-01	18.5017
2015-01-01	2.8184
2015-04-01	2.0861