Quarter	Billions of US Dollars
1998-04-01	0.59419
1998-07-01	0.60947
1998-10-01	0.67483
1999-01-01	0.73189
1999-04-01	0.07500
1999-07-01	0.07500
1999-10-01	0.07500
2000-01-01	0.05000
2000-04-01	0.05000
2000-07-01	0.05000
2000-10-01	0.31110
2001-01-01	0.24077
2001-04-01	0.24184
2001-07-01	0.25147
2006-04-01	0.35636
2006-07-01	0.36213
2006-10-01	0.36799
2007-01-01	0.37395
2007-10-01	0.50000
2008-01-01	0.50000
2008-04-01	0.50000
2008-07-01	0.50000
2010-10-01	0.22936
2011-01-01	0.25405
2011-04-01	0.25120
2011-07-01	0.22830
2011-10-01	0.00599
2012-01-01	0.00610
2012-04-01	0.01471
2012-07-01	0.01856
2012-10-01	0.23160
2013-01-01	0.31339
2013-04-01	0.34057
2013-07-01	0.34935
2013-10-01	0.15260
2014-01-01	0.12370
2014-04-01	0.09319
2014-07-01	0.08806
2014-10-01	0.06603
2015-01-01	0.02341
2015-04-01	0.02025