Quarter	Billions of US Dollars
1985-01-01	0.01980
1985-04-01	0.02008
1985-07-01	0.02304
1985-10-01	0.02494
1986-01-01	0.02784
1986-04-01	0.03030
1986-07-01	0.06055
1986-10-01	0.05845
1987-01-01	0.06379
1987-04-01	0.06327
1987-07-01	0.06355
1987-10-01	0.07530
1988-01-01	0.07416
1988-04-01	0.10801
1988-07-01	0.10628
1988-10-01	0.11363
1989-01-01	0.10829
1989-04-01	0.09924
1989-07-01	0.10266
1989-10-01	0.09969
1990-01-01	0.05916
1990-04-01	0.06082
1990-07-01	0.06749
1990-10-01	0.06920
1991-01-01	0.06596
1991-04-01	0.06744
1991-07-01	0.03764
1991-10-01	0.03994
1992-01-01	0.03754
1992-04-01	0.03984
1992-07-01	0.04195
1992-10-01	0.04008
1993-01-01	0.04297
1993-04-01	0.04684
1993-07-01	0.04755
1993-10-01	0.04470
1994-01-01	0.04847
1994-04-01	0.06398
1994-07-01	0.06429
1994-10-01	0.09363
1995-01-01	0.09946
1995-04-01	0.10260
1995-07-01	0.09436
1995-10-01	0.09212
1996-01-01	0.09055
1996-04-01	0.07570
1996-07-01	0.08856
1996-10-01	0.08660
1997-01-01	0.08381
1997-04-01	0.07371
1997-07-01	0.07132
1997-10-01	0.06848
1998-01-01	0.06786
1998-04-01	0.03000
1998-07-01	0.03000
1998-10-01	0.03000
1999-01-01	0.03000
1999-04-01	0.03000
1999-07-01	0.03000
2000-04-01	0.10000
2000-07-01	0.10000
2000-10-01	0.10000
2001-01-01	0.10000
2001-04-01	0.10000
2001-07-01	0.10000
2001-10-01	0.25000
2002-01-01	0.25000
2002-04-01	0.25000
2002-07-01	0.25000
2002-10-01	0.25000
2003-01-01	0.25000
2003-04-01	0.25000
2003-07-01	0.25000
2003-10-01	0.25000
2004-01-01	0.25000
2004-04-01	0.25000
2004-07-01	0.25000
2004-10-01	0.26386
2005-01-01	0.47765
2005-04-01	0.48254
2005-07-01	0.47485
2005-10-01	0.58888
2006-01-01	0.58838
2006-04-01	0.73849
2006-07-01	0.76336
2006-10-01	0.81331
2007-01-01	0.81337
2007-04-01	0.82313
2007-07-01	0.85049
2007-10-01	0.90404
2008-01-01	1.24740
2008-04-01	1.24718
2008-07-01	1.25225
2008-10-01	1.23777
2009-01-01	1.21667
2009-04-01	1.19175
2009-07-01	1.19701
2009-10-01	1.63516
2010-01-01	1.26639
2010-04-01	1.35139
2010-07-01	1.55139
2010-10-01	1.54108
2011-01-01	1.54121
2011-04-01	1.54121
2011-07-01	1.40018
2011-10-01	1.39514
2012-01-01	1.39530
2012-04-01	1.40718
2012-07-01	1.65736
2012-10-01	1.64873
2013-01-01	1.64854
2013-04-01	2.12065
2013-07-01	2.12835
2013-10-01	2.15020
2014-01-01	3.40025
2014-04-01	2.95037
2014-07-01	2.95011
2014-10-01	2.75994
2015-01-01	2.75970
2015-04-01	2.75998