Quarter	Billions of US Dollars
1987-01-01	0.00700
1988-07-01	0.14300
1988-10-01	0.06100
1989-01-01	0.14200
1989-04-01	0.11600
1989-07-01	0.11500
1989-10-01	0.08100
1990-01-01	0.05800
1990-04-01	0.10000
1990-07-01	0.17600
1990-10-01	0.08700
1991-01-01	0.19900
1991-04-01	0.33100
1991-07-01	0.27300
1991-10-01	0.15200
1992-01-01	0.15900
1992-04-01	0.27100
1992-07-01	0.26000
1992-10-01	0.15800
1993-01-01	0.11600
1993-04-01	0.26800
1994-04-01	0.12300
1994-10-01	0.07086
1995-01-01	0.06802
1995-04-01	0.07194
1995-07-01	0.08046
1995-10-01	0.07530
1996-01-01	0.07274
1996-04-01	0.10014
1996-07-01	0.08602
1996-10-01	0.13067
1997-01-01	0.06254
1997-04-01	0.17226
1997-07-01	0.28157
1997-10-01	0.27973
1998-01-01	0.32047
1998-04-01	0.75804
1998-07-01	0.96488
1998-10-01	0.98578
1999-01-01	1.31250
1999-04-01	1.43789
1999-07-01	2.26393
1999-10-01	1.94652
2000-01-01	1.21429
2000-04-01	1.31127
2000-07-01	1.37954
2000-10-01	1.21191
2001-01-01	1.69913
2001-04-01	0.83569
2001-07-01	0.87449
2001-10-01	0.95273
2002-01-01	0.91046
2002-04-01	0.92552
2002-07-01	1.22125
2002-10-01	1.00901
2003-01-01	0.90184
2003-04-01	1.08915
2003-07-01	1.14673
2003-10-01	0.83577
2004-01-01	0.55963
2004-04-01	0.74721
2004-07-01	1.13802
2004-10-01	0.90414
2005-01-01	0.58673
2005-04-01	0.58187
2005-07-01	1.08262
2005-10-01	0.89840
2006-01-01	1.15947
2006-04-01	1.17038
2006-07-01	0.92928
2006-10-01	0.73534
2007-01-01	1.31628
2007-04-01	1.05022
2007-07-01	0.67981
2007-10-01	1.28905
2008-01-01	1.04153
2008-04-01	1.02757
2008-07-01	0.80932
2008-10-01	0.55081
2009-01-01	0.33935
2009-04-01	0.42543
2009-07-01	0.45979
2009-10-01	0.19347
2010-01-01	0.48467
2010-04-01	0.25839
2010-07-01	0.24027
2010-10-01	0.20908
2011-01-01	0.18769
2011-04-01	0.17210
2011-07-01	0.16099
2011-10-01	0.15204
2012-01-01	0.21431
2012-04-01	0.23619
2012-07-01	0.15904
2012-10-01	0.15173
2013-01-01	0.40976
2013-04-01	0.20012
2013-07-01	0.32682
2013-10-01	0.22652
2014-01-01	0.42012
2014-04-01	0.31230
2014-07-01	0.26775
2014-10-01	0.33309
2015-01-01	0.42845
2015-04-01	0.18165