Quarter	Billions of US Dollars
1988-01-01	0.0980
1988-04-01	0.0800
1988-07-01	0.0800
1988-10-01	0.0900
1989-01-01	0.0900
1989-04-01	0.0900
1989-07-01	0.0900
1989-10-01	0.0800
1990-01-01	0.0800
1990-04-01	0.0400
1990-07-01	0.0400
1990-10-01	0.1900
1991-01-01	0.1900
1991-04-01	0.1900
1991-07-01	0.1900
1991-10-01	0.1500
1992-01-01	0.1500
1992-04-01	0.1500
1992-07-01	0.1500
1992-10-01	0.1500
1993-01-01	0.1500
1993-04-01	0.0750
1993-07-01	0.1500
1993-10-01	0.0900
1994-01-01	0.1500
1994-04-01	0.1500
1994-07-01	0.1500
1994-10-01	0.1500
1995-01-01	0.1500
1995-04-01	0.1500
1995-07-01	0.1500
1997-01-01	0.0750
1997-04-01	0.0044
1997-07-01	0.0200
1997-10-01	0.1084
1998-01-01	0.1501
1998-04-01	0.1867
1998-07-01	0.2774
1998-10-01	0.2749
1999-01-01	0.2117
1999-04-01	0.4329
1999-07-01	0.4856
1999-10-01	0.4916
2000-01-01	0.3146
2000-04-01	0.3243
2000-07-01	0.3972
2000-10-01	0.4285
2001-01-01	0.4847
2001-04-01	0.5849
2001-07-01	0.5481
2001-10-01	0.5642
2002-01-01	0.4898
2002-04-01	0.8429
2002-07-01	1.0347
2002-10-01	0.9302
2003-01-01	0.7312
2003-04-01	1.0395
2003-07-01	0.9453
2003-10-01	0.8695
2004-01-01	0.8823
2004-04-01	0.7436
2004-07-01	1.4735
2004-10-01	2.2690
2005-01-01	4.6048
2005-04-01	2.8904
2005-07-01	3.4286
2005-10-01	3.2120
2006-01-01	3.2255
2006-04-01	3.6649
2006-07-01	4.2114
2006-10-01	3.9563
2007-01-01	3.7706
2007-04-01	5.0680
2007-07-01	4.2968
2007-10-01	3.4122
2008-01-01	3.5527
2008-04-01	2.9361
2008-07-01	3.3947
2008-10-01	2.1145
2009-01-01	2.0521
2009-04-01	2.2696
2009-07-01	2.3737
2009-10-01	2.0081
2010-01-01	2.6883
2010-04-01	2.1709
2010-07-01	3.0483
2010-10-01	2.9338
2011-01-01	4.2124
2011-04-01	6.1336
2011-07-01	9.3717
2011-10-01	11.1122
2012-01-01	11.4959
2012-04-01	10.3617
2012-07-01	9.0221
2012-10-01	7.9863
2013-01-01	10.2278
2013-04-01	15.1400
2013-07-01	23.7107
2013-10-01	26.2005
2014-01-01	26.8361
2014-04-01	28.5983
2014-07-01	28.9279
2014-10-01	25.9303
2015-01-01	21.3526
2015-04-01	23.2438