Quarter	Billions of US Dollars
1987-01-01	0.24100
1987-04-01	0.25200
1987-07-01	0.20100
1987-10-01	0.27300
1988-01-01	0.27900
1988-04-01	0.24200
1988-07-01	0.20800
1988-10-01	0.20900
1989-01-01	0.25400
1989-04-01	0.29000
1989-07-01	0.28100
1989-10-01	0.17200
1990-01-01	0.24200
1990-04-01	0.20400
1990-07-01	0.13800
1990-10-01	0.03600
1991-01-01	0.16700
1991-04-01	0.16800
1991-07-01	0.11200
1991-10-01	0.10500
1992-01-01	0.08300
1992-04-01	0.11300
1992-07-01	0.10200
1992-10-01	0.06800
1993-01-01	0.09900
1993-04-01	0.10000
1993-07-01	0.18950
1993-10-01	0.19650
1994-01-01	0.19300
1994-04-01	0.14500
1994-07-01	0.07450
1994-10-01	0.07850
1995-01-01	0.05700
1995-04-01	0.03150
1995-07-01	0.01900
1995-10-01	0.02500
1996-01-01	0.02000
1996-04-01	0.01500
1996-07-01	0.01500
1996-10-01	0.01600
1997-01-01	0.01600
1997-10-01	0.00800
1998-01-01	0.00800
1998-04-01	0.01000
1998-07-01	0.01000
2005-04-01	0.02500
2005-07-01	0.02500
2005-10-01	0.02500
2006-01-01	0.02500
2006-07-01	0.01541
2006-10-01	0.01544
2007-01-01	0.05531
2007-04-01	0.05530
2007-07-01	0.04017
2007-10-01	0.07899
2009-04-01	0.05000
2009-07-01	0.06500
2009-10-01	0.05000
2010-01-01	0.06500
2010-04-01	0.10784
2010-07-01	0.15085
2010-10-01	0.12325
2011-01-01	0.05944
2011-04-01	0.02847
2012-01-01	1.41456
2012-04-01	1.60900
2012-07-01	1.46065
2012-10-01	1.40428
2013-01-01	0.76737
2013-04-01	0.56303
2013-07-01	0.59552
2013-10-01	0.73639
2014-01-01	0.63725
2014-04-01	0.42422
2014-07-01	0.45687
2014-10-01	0.29961
2015-01-01	0.10520
2015-04-01	0.20104