Quarter	Billions of US Dollars
1987-01-01	0.32400
1987-04-01	0.19900
1987-07-01	0.33000
1987-10-01	0.33000
1988-01-01	0.33000
1988-04-01	0.25000
1988-07-01	0.25100
1988-10-01	0.22300
1989-01-01	0.18800
1989-04-01	0.18800
1989-07-01	0.18800
1989-10-01	0.05300
1990-01-01	0.05500
1990-04-01	0.18300
1990-07-01	0.48900
1990-10-01	0.91200
1991-01-01	0.02400
1991-04-01	0.13400
1991-07-01	0.42000
1991-10-01	0.86500
1992-01-01	0.33900
1992-04-01	0.39100
1992-07-01	1.39200
1992-10-01	1.63700
1993-01-01	1.72600
1993-04-01	2.60100
1993-07-01	2.95492
1993-10-01	3.32856
1994-01-01	4.13175
1994-04-01	4.29668
1994-07-01	4.88816
1994-10-01	3.53754
1995-01-01	1.16907
1995-04-01	0.38750
1995-07-01	0.90800
1995-10-01	0.70803
1996-01-01	0.76603
1996-04-01	1.76450
1996-07-01	0.69915
1996-10-01	0.62621
1997-01-01	0.53447
1997-04-01	0.54500
1997-07-01	0.50175
1997-10-01	0.44491
1998-01-01	0.56291
1998-04-01	0.50152
1998-07-01	0.51470
1998-10-01	0.36905
1999-01-01	0.40725
1999-04-01	0.48920
1999-07-01	0.52647
1999-10-01	0.59420
2000-01-01	0.58188
2000-04-01	0.61445
2000-07-01	0.65322
2000-10-01	0.63371
2001-01-01	0.77551
2001-04-01	0.80485
2001-07-01	0.65416
2001-10-01	0.56195
2002-01-01	0.49707
2002-04-01	0.54667
2002-07-01	0.50772
2002-10-01	0.41995
2003-01-01	0.39949
2003-04-01	0.29771
2003-07-01	0.18437
2003-10-01	0.18507
2004-01-01	0.14277
2004-04-01	0.10240
2004-07-01	0.12445
2004-10-01	0.18806
2005-01-01	0.25659
2005-04-01	0.24411
2005-07-01	0.24299
2005-10-01	0.18797
2006-01-01	0.23421
2006-04-01	0.28467
2006-07-01	0.36508
2006-10-01	0.34045
2007-01-01	0.19631
2007-04-01	0.07231
2007-07-01	0.08345
2007-10-01	0.07850
2008-01-01	0.08000
2008-04-01	0.08200
2008-07-01	0.08800
2008-10-01	0.07050
2009-01-01	0.06100
2009-04-01	0.06300
2009-07-01	0.05700
2009-10-01	0.10950
2010-01-01	0.07450
2010-04-01	0.07450
2010-07-01	0.07510
2010-10-01	0.00410
2011-01-01	0.06085
2011-04-01	0.07010
2011-07-01	0.05000
2011-10-01	0.05000
2012-01-01	0.07650
2012-04-01	0.07650
2012-07-01	0.08175
2012-10-01	0.05000
2013-01-01	0.06060
2013-04-01	0.08758
2013-07-01	0.10561
2013-10-01	0.08457
2014-01-01	0.09456
2014-04-01	0.08692
2014-07-01	0.14000
2014-10-01	0.18500
2015-01-01	0.15800
2015-04-01	0.15800