Quarter	Billions of US Dollars
1997-04-01	0.05
1997-07-01	0.05
1997-10-01	0.05
1998-01-01	0.05
1998-04-01	0.05
1998-07-01	0.05
1998-10-01	0.05
1999-01-01	0.05
1999-04-01	0.05
1999-07-01	0.05
1999-10-01	0.05
2000-01-01	0.05
2002-07-01	0.35
2002-10-01	0.35
2003-01-01	0.35
2003-04-01	0.35
2003-07-01	0.35
2003-10-01	0.35
2004-01-01	0.35
2004-04-01	0.35
2004-07-01	0.35
2004-10-01	0.35
2005-01-01	0.35
2005-04-01	0.35
2005-07-01	0.35
2005-10-01	0.35
2006-01-01	0.35
2006-04-01	0.35
2006-07-01	0.35
2006-10-01	0.35
2007-01-01	0.35
2007-04-01	0.35
2007-07-01	0.35
2007-10-01	0.85
2008-01-01	0.85
2008-04-01	0.85
2008-07-01	0.85
2008-10-01	0.85
2009-01-01	0.85
2009-04-01	0.85
2009-07-01	0.85
2009-10-01	1.35
2010-01-01	1.35
2010-04-01	1.35
2010-07-01	1.35
2010-10-01	2.35
2011-01-01	2.35
2011-04-01	2.35
2011-07-01	3.35
2011-10-01	3.35
2012-01-01	3.35
2012-04-01	3.35
2012-07-01	4.35
2012-10-01	3.85
2013-01-01	3.85
2013-04-01	3.85
2013-07-01	3.85
2013-10-01	3.85
2014-01-01	4.85
2014-04-01	5.35
2014-07-01	5.35
2014-10-01	5.35
2015-01-01	4.85
2015-04-01	5.50