Quarter	Billions of US Dollars
2002-01-01	0.140
2002-04-01	0.140
2002-07-01	0.140
2002-10-01	0.140
2003-01-01	0.140
2003-04-01	0.140
2003-07-01	0.140
2003-10-01	0.140
2004-01-01	0.140
2004-04-01	0.240
2004-07-01	0.240
2004-10-01	0.240
2005-01-01	0.240
2005-04-01	0.240
2005-07-01	0.240
2005-10-01	0.240
2006-01-01	0.240
2006-04-01	0.240
2006-07-01	0.365
2006-10-01	0.365
2007-01-01	0.365
2007-04-01	0.365
2007-07-01	0.365
2007-10-01	0.365
2008-01-01	0.365
2008-04-01	0.365
2008-07-01	0.365
2008-10-01	0.365
2009-01-01	0.365
2009-04-01	0.365
2009-07-01	0.290
2009-10-01	0.290
2010-01-01	0.290
2010-04-01	0.150
2010-07-01	0.170
2010-10-01	0.170
2011-01-01	0.170
2011-04-01	0.170
2011-07-01	0.020
2011-10-01	0.020
2012-01-01	0.020
2012-04-01	0.020
2015-04-01	0.300