Quarter	Billions of US Dollars
1994-04-01	0.02000
1994-07-01	0.02000
1994-10-01	0.02000
1996-04-01	0.02000
1998-04-01	0.15000
1998-07-01	0.15000
1998-10-01	0.20000
1999-01-01	0.20000
1999-04-01	0.05000
1999-07-01	0.05000
2004-07-01	0.15511
2004-10-01	0.17026
2005-01-01	0.16205
2005-04-01	0.15115
2007-04-01	0.20258
2007-07-01	0.21269
2007-10-01	0.22081
2008-01-01	0.23718
2014-10-01	0.50551
2015-01-01	0.62157
2015-04-01	0.64918