Quarter	Billions of US Dollars
1993-07-01	0.05880
1993-10-01	0.05600
1994-01-01	0.05773
1997-07-01	0.01062
1997-10-01	0.01165
1998-01-01	0.06059
1998-04-01	0.06064
1998-07-01	0.26328
1998-10-01	0.38976
1999-01-01	0.31513
1999-04-01	0.30832
1999-07-01	0.21223
1999-10-01	0.24299
2000-01-01	0.23125
2000-04-01	0.34845
2000-07-01	0.23989
2000-10-01	0.24115
2001-01-01	0.33661
2001-04-01	0.25846
2001-07-01	0.51265
2001-10-01	0.40027
2002-01-01	0.29155
2002-04-01	0.36266
2002-07-01	0.15339
2002-10-01	0.12771
2003-01-01	0.13158
2003-04-01	0.05665
2003-10-01	0.20055
2004-01-01	0.19531
2004-04-01	0.39313
2004-07-01	0.39967
2004-10-01	0.33256
2005-01-01	0.32550
2005-04-01	0.11674
2005-07-01	0.11626
2007-07-01	0.05128
2007-10-01	0.05331
2008-01-01	0.06037
2008-04-01	0.05896
2008-10-01	0.05567
2009-01-01	0.11472
2009-04-01	0.12133
2009-07-01	0.41946
2009-10-01	0.35605
2010-01-01	0.33697
2010-04-01	0.30677
2010-07-01	0.06824
2010-10-01	0.15366
2011-01-01	0.09235
2011-04-01	0.09394
2011-07-01	5.48897
2011-10-01	5.19533
2012-01-01	5.36276
2012-04-01	5.05519
2012-07-01	0.01971
2013-01-01	0.05000
2013-04-01	0.05000
2013-07-01	0.30409
2013-10-01	0.72128
2014-01-01	0.67679
2014-04-01	1.00433
2014-07-01	0.90048
2014-10-01	0.57968
2015-01-01	0.55990
2015-04-01	0.51254