Quarter	Billions of US Dollars
1987-10-01	0.01500
1988-01-01	0.08200
1988-04-01	0.11900
1988-07-01	0.05500
1988-10-01	0.04700
1989-01-01	0.05900
1989-04-01	0.05700
1989-07-01	0.07600
1989-10-01	0.02200
1990-01-01	0.06500
1990-04-01	0.16400
1990-07-01	0.14600
1990-10-01	0.11700
1991-01-01	0.15400
1991-04-01	0.28600
1991-07-01	0.22400
1991-10-01	0.20700
1992-01-01	0.23300
1992-04-01	0.22800
1992-07-01	0.18800
1992-10-01	0.10600
1993-01-01	0.37600
1993-04-01	0.16100
1993-07-01	0.16491
1993-10-01	0.16939
1994-01-01	0.14080
1994-04-01	0.18043
1994-07-01	0.11860
1994-10-01	0.31453
1995-01-01	0.27685
1995-04-01	0.15830
1995-07-01	0.20330
1995-10-01	0.14565
1996-01-01	0.29661
1996-04-01	0.28919
1996-07-01	0.37940
1996-10-01	0.33339
1997-01-01	0.66582
1997-04-01	0.76818
1997-07-01	0.31046
1997-10-01	0.29778
1998-01-01	0.03127
1998-04-01	0.02900
1998-07-01	0.02200
1999-01-01	0.06356
1999-10-01	0.02935
2000-01-01	0.05334
2000-04-01	0.05346
2000-07-01	0.08063
2000-10-01	0.03833
2001-01-01	0.03563
2001-04-01	0.02418
2005-10-01	0.09000
2006-01-01	0.13721
2006-04-01	0.13950
2006-07-01	0.21794
2006-10-01	0.11867
2007-01-01	0.58641
2007-04-01	0.33030
2007-07-01	0.12700
2007-10-01	0.12700
2008-01-01	0.12700
2008-04-01	0.09930
2008-07-01	0.10250
2008-10-01	0.08250
2009-01-01	0.08250
2009-04-01	0.08250
2009-07-01	0.07950
2009-10-01	0.07950
2010-01-01	0.07950
2010-04-01	0.07950
2010-07-01	0.07950
2010-10-01	0.07950
2011-01-01	0.08050
2011-04-01	0.01134
2011-07-01	0.01071
2011-10-01	0.00966
2012-01-01	0.01761
2012-04-01	0.48411
2012-07-01	0.29896
2012-10-01	0.16783
2013-01-01	0.25170
2013-04-01	0.31297
2013-07-01	0.50109
2013-10-01	0.98581
2014-01-01	1.36439
2014-04-01	1.37362
2014-07-01	1.14208
2014-10-01	0.94021
2015-01-01	0.87702
2015-04-01	0.71851