Quarter	Billions of US Dollars
1987-10-01	0.0085
1988-07-01	0.0979
1989-07-01	1.4754
1990-01-01	0.1358
1990-07-01	-0.0150
1991-07-01	0.2603
1992-10-01	-0.1094
1993-01-01	0.1200
1993-07-01	-0.1015
1994-01-01	0.0633
1994-07-01	-0.1478
1994-10-01	0.1436
1995-01-01	0.6768
1995-04-01	0.0115
1995-07-01	0.1678
1995-10-01	0.5334
1996-01-01	0.2581
1996-04-01	0.2658
1996-07-01	1.5305
1996-10-01	1.7141
1997-01-01	3.0470
1997-04-01	1.4862
1997-07-01	1.4787
1997-10-01	1.1119
1998-01-01	-0.0822
1998-04-01	1.7771
1998-07-01	1.5247
1998-10-01	0.1243
1999-01-01	2.0474
1999-04-01	0.3137
1999-07-01	0.8235
1999-10-01	1.6967
2000-01-01	1.9639
2000-04-01	1.5479
2000-07-01	1.1718
2000-10-01	3.7435
2001-01-01	3.6681
2001-04-01	2.6236
2001-07-01	-2.7566
2001-10-01	0.4504
2002-01-01	3.2159
2002-04-01	1.0669
2002-07-01	-2.2894
2002-10-01	0.3703
2003-01-01	9.5467
2003-04-01	10.0406
2003-07-01	3.7115
2003-10-01	8.5850
2004-01-01	16.7584
2004-04-01	10.6473
2004-07-01	12.0408
2004-10-01	7.0765
2005-01-01	16.5031
2005-04-01	17.9583
2005-07-01	8.6996
2005-10-01	12.5038
2006-01-01	8.9261
2006-04-01	15.8019
2006-07-01	16.4366
2006-10-01	25.7883
2007-01-01	16.1658
2007-04-01	10.9110
2007-07-01	16.2507
2007-10-01	4.4033
2008-01-01	18.8593
2008-04-01	-2.5035
2008-07-01	-11.5726
2008-10-01	-19.8768
2009-01-01	-16.3648
2009-04-01	3.1270
2009-07-01	21.3795
2009-10-01	-3.3922
2010-01-01	19.5295
2010-04-01	-15.7412
2010-07-01	-30.1973
2010-10-01	-9.3087
2011-01-01	-2.9822
2011-04-01	-2.8065
2011-07-01	-21.4445
2011-10-01	-6.2397
2012-01-01	-14.7347
2012-04-01	-4.0591
2012-07-01	-22.1614
2012-10-01	4.2645
2013-01-01	-0.4710
2013-04-01	-11.8819
2013-07-01	-10.0725
2013-10-01	3.9513
2014-01-01	-3.2248
2014-04-01	-1.6922
2014-07-01	-6.5658
2014-10-01	-5.4605
2015-01-01	-9.5053
2015-04-01	-0.0432