Quarter	Billions of US Dollars
2006-01-01	0.100
2006-04-01	0.100
2006-07-01	0.280
2006-10-01	0.280
2007-01-01	1.680
2007-04-01	1.680
2007-07-01	1.680
2007-10-01	1.680
2008-01-01	1.680
2008-04-01	1.680
2008-07-01	1.680
2008-10-01	1.680
2009-01-01	2.015
2009-04-01	2.015
2009-07-01	2.175
2009-10-01	2.675
2010-01-01	3.450
2010-04-01	3.450
2010-07-01	3.450
2010-10-01	3.750
2011-01-01	3.750
2011-04-01	3.750
2011-07-01	3.750
2011-10-01	3.750
2012-01-01	3.750
2012-04-01	3.750
2012-07-01	5.250
2012-10-01	3.850
2013-01-01	3.750
2013-04-01	3.750
2013-07-01	3.750
2013-10-01	4.250
2014-01-01	4.250
2014-04-01	4.755
2014-07-01	4.755
2014-10-01	4.755
2015-01-01	4.755
2015-04-01	3.955