Quarter	Billions of US Dollars
1991-01-01	0.29600
1991-04-01	0.26800
1991-07-01	0.27600
1991-10-01	0.27800
1992-01-01	0.27600
1992-04-01	0.45200
1992-07-01	0.19900
1992-10-01	0.16800
1993-01-01	0.12500
1993-04-01	0.13000
1995-07-01	0.00300
1995-10-01	0.01130
1996-01-01	0.01050
1996-04-01	0.01000
1996-07-01	0.02600
1996-10-01	0.02645
1997-01-01	0.02645
1997-04-01	0.02600
1997-07-01	0.04195
1997-10-01	0.04195
1998-01-01	0.04195
1998-04-01	0.05927
1998-07-01	0.05457
1998-10-01	0.04915
1999-01-01	0.04564
1999-04-01	0.04918
1999-07-01	0.04970
1999-10-01	0.04874
2000-01-01	0.06508
2000-04-01	0.06091
2000-07-01	0.04668
2000-10-01	0.04271
2001-01-01	0.05329
2001-04-01	0.05776
2001-07-01	0.05851
2001-10-01	0.05818
2002-01-01	0.04720
2002-04-01	0.24863
2002-07-01	0.24464
2002-10-01	0.23330
2003-01-01	0.22725
2003-04-01	0.22780
2003-07-01	0.42804
2003-10-01	0.42905
2004-01-01	0.44253
2004-04-01	0.64245
2004-07-01	0.66175
2004-10-01	0.66319
2005-01-01	0.64839
2005-04-01	0.64749
2005-07-01	0.64744
2005-10-01	0.64719
2006-01-01	0.64750
2006-04-01	0.61313
2006-07-01	0.61308
2006-10-01	0.61360
2007-01-01	0.61376
2007-04-01	0.61395
2007-07-01	0.61465
2007-10-01	0.61521
2008-01-01	0.61633
2008-04-01	0.71628
2008-07-01	0.71477
2008-10-01	0.71438
2009-01-01	0.71375
2009-04-01	0.71460
2009-07-01	0.71512
2009-10-01	1.31488
2010-01-01	1.31392
2010-04-01	1.31267
2010-07-01	1.31410
2010-10-01	1.31380
2011-01-01	1.31467
2011-04-01	1.31493
2011-07-01	1.11395
2011-10-01	1.18226
2012-01-01	1.18270
2012-04-01	1.40690
2012-07-01	1.40726
2012-10-01	2.05753
2013-01-01	2.05713
2013-04-01	2.05741
2013-07-01	2.05785
2013-10-01	2.05814
2014-01-01	2.35814
2014-04-01	2.35801
2014-07-01	3.40357
2014-10-01	3.40311
2015-01-01	3.40168
2015-04-01	3.40213