Quarter	Billions of US Dollars
1987-01-01	0.03984
1987-04-01	0.03947
1987-07-01	0.03924
1987-10-01	0.04695
1988-01-01	0.04384
1988-04-01	0.03975
1988-07-01	0.03775
1988-10-01	0.06489
1989-01-01	0.09514
1989-04-01	0.08686
1989-07-01	0.06208
1989-10-01	0.06580
1990-01-01	0.08909
1990-04-01	0.12433
1990-07-01	0.14319
1990-10-01	0.09831
1991-10-01	0.01000
1992-01-01	0.01000
1992-04-01	0.01000
1992-07-01	0.11000
1992-10-01	0.11000
1993-01-01	0.31000
1993-04-01	0.31000
1993-07-01	0.31000
1993-10-01	0.48500
1994-01-01	1.21500
1994-04-01	1.35558
1994-07-01	1.65594
1994-10-01	1.77122
1995-01-01	1.88642
1995-04-01	1.90519
1995-07-01	1.98352
1995-10-01	2.38311
1996-01-01	2.89742
1996-04-01	3.03229
1996-07-01	4.03613
1996-10-01	4.45793
1997-01-01	4.86592
1997-04-01	4.97294
1997-07-01	4.86411
1997-10-01	4.83354
1998-01-01	4.60880
1998-04-01	4.60319
1998-07-01	4.61536
1998-10-01	4.54427
1999-01-01	4.46726
1999-04-01	4.19031
1999-07-01	4.19203
1999-10-01	4.03750
2000-01-01	3.93750
2000-04-01	3.93750
2000-07-01	3.93750
2000-10-01	3.83750
2001-01-01	3.58500
2001-04-01	3.58500
2001-07-01	2.77500
2001-10-01	2.57500
2002-01-01	2.57500
2002-04-01	2.45500
2002-07-01	2.45500
2002-10-01	2.40500
2003-01-01	2.40500
2003-04-01	2.40500
2003-07-01	2.40500
2003-10-01	2.40500
2004-01-01	1.78000
2004-04-01	1.93000
2004-07-01	1.97910
2004-10-01	1.98565
2005-01-01	2.38247
2005-04-01	2.53964
2005-07-01	2.23722
2005-10-01	2.23324
2006-01-01	2.08370
2006-04-01	2.57569
2006-07-01	2.87338
2006-10-01	3.31183
2007-01-01	3.01499
2007-04-01	3.01174
2007-07-01	3.01832
2007-10-01	3.02063
2008-01-01	3.18936
2008-04-01	3.17805
2008-07-01	3.17899
2008-10-01	3.19285
2009-01-01	3.18259
2009-04-01	2.73822
2009-07-01	2.47460
2009-10-01	2.32503
2010-01-01	2.07734
2010-04-01	1.74097
2010-07-01	1.74613
2010-10-01	3.09672
2011-01-01	3.09632
2011-04-01	3.35131
2011-07-01	3.05021
2011-10-01	3.04889
2012-01-01	4.25106
2012-04-01	4.24855
2012-07-01	5.95109
2012-10-01	5.95162
2013-01-01	6.30530
2013-04-01	6.42532
2013-07-01	6.42464
2013-10-01	7.42119
2014-01-01	7.42206
2014-04-01	8.87203
2014-07-01	8.87222
2014-10-01	8.77084
2015-01-01	8.81948
2015-04-01	8.81579