Quarter	Billions of US Dollars
1993-07-01	-3.0982
1993-10-01	0.4058
1994-01-01	-4.2134
1994-04-01	-2.8171
1994-07-01	-1.8766
1994-10-01	0.4192
1995-01-01	-1.2017
1995-04-01	-1.5289
1995-07-01	0.8473
1995-10-01	0.7371
1996-01-01	0.6394
1996-04-01	1.0715
1996-07-01	-1.3694
1996-10-01	-1.8620
1997-01-01	0.3982
1997-04-01	-0.3231
1997-07-01	1.1349
1997-10-01	-3.7780
1998-01-01	0.8692
1998-04-01	4.5301
1998-07-01	2.5482
1998-10-01	-2.0124
1999-01-01	1.4937
1999-04-01	3.7123
1999-07-01	-1.1948
1999-10-01	-1.9185
2000-01-01	-1.6029
2000-04-01	0.4283
2000-07-01	2.2299
2000-10-01	-2.2951
2001-01-01	-0.3627
2001-04-01	-1.4300
2001-07-01	-1.8695
2001-10-01	-1.4263
2002-01-01	3.4034
2002-04-01	5.0377
2002-07-01	0.2040
2002-10-01	-0.3215
2003-01-01	1.4135
2003-04-01	3.6840
2003-07-01	3.5607
2003-10-01	6.3508
2004-01-01	4.4029
2004-04-01	0.7812
2004-07-01	4.4821
2004-10-01	0.6917
2005-01-01	4.4724
2005-04-01	2.0460
2005-07-01	0.3084
2005-10-01	8.2128
2006-01-01	8.2729
2006-04-01	8.6899
2006-07-01	2.8138
2006-10-01	8.5684
2007-01-01	10.1430
2007-04-01	10.9436
2007-07-01	-2.4835
2007-10-01	4.3594
2008-01-01	1.8490
2008-04-01	4.8397
2008-07-01	4.7986
2008-10-01	2.9855
2009-01-01	12.8634
2009-04-01	9.1932
2009-07-01	-2.2214
2009-10-01	2.0176
2010-01-01	0.4605
2010-04-01	-0.3744
2010-07-01	4.0385
2010-10-01	-3.4552
2011-01-01	2.7544
2011-04-01	-3.4485
2011-07-01	-6.0529
2011-10-01	-8.1370
2012-01-01	-3.3145
2012-04-01	-9.0687
2012-07-01	6.3716
2012-10-01	-4.0441
2013-01-01	-12.7904
2013-04-01	-3.5255
2013-07-01	-9.0048
2013-10-01	-11.1724
2014-01-01	-4.3230
2014-04-01	-3.1638
2014-07-01	-2.1815
2014-10-01	-8.5505
2015-01-01	-15.2697
2015-04-01	-9.2854