Quarter	Billions of US Dollars
1988-01-01	0.0752
1988-07-01	0.2682
1989-01-01	0.4560
1989-07-01	0.4408
1990-01-01	0.2912
1993-04-01	-0.1000
1994-01-01	-0.0943
1994-07-01	-0.0498
1995-01-01	-0.3378
1995-07-01	-0.4484
1995-10-01	0.0334
1996-01-01	-0.0047
1996-04-01	0.0463
1996-07-01	-0.9934
1996-10-01	0.0050
1997-01-01	0.0300
1997-04-01	0.1050
1997-07-01	0.1515
1997-10-01	0.1615
1998-01-01	-0.1150
1998-04-01	-0.0860
1998-07-01	-0.0997
1998-10-01	-0.0635
1999-01-01	-0.0060
1999-04-01	-0.0050
1999-07-01	-0.0105
2000-07-01	-0.2000
2001-04-01	0.1000
2002-10-01	0.1250
2003-04-01	0.4750
2003-10-01	1.3500
2004-01-01	0.3750
2004-04-01	0.3750
2004-07-01	0.8500
2004-10-01	1.1500
2005-01-01	1.2157
2005-04-01	1.9972
2005-07-01	0.8500
2005-10-01	1.4750
2006-01-01	1.7260
2006-04-01	2.3909
2006-07-01	1.0437
2006-10-01	4.8994
2007-01-01	3.9763
2007-04-01	6.5432
2007-07-01	-0.9546
2007-10-01	4.5223
2008-01-01	0.0476
2008-04-01	7.0446
2008-07-01	-0.3161
2008-10-01	-1.0650
2009-01-01	-2.1464
2009-04-01	0.4382
2009-07-01	-1.1709
2009-10-01	-2.3650
2010-01-01	0.9573
2010-04-01	-2.4655
2010-07-01	10.0140
2010-10-01	8.5946
2011-01-01	2.3502
2011-04-01	3.4148
2011-07-01	-1.2963
2011-10-01	-0.6221
2012-01-01	5.8038
2012-04-01	6.7644
2012-07-01	22.5647
2012-10-01	9.0129
2013-01-01	6.3130
2013-04-01	-1.8104
2013-07-01	0.1585
2013-10-01	4.5667
2014-01-01	3.2149
2014-04-01	-1.8355
2014-07-01	1.9065
2014-10-01	-0.4690
2015-01-01	-2.7874
2015-04-01	-0.7219