Quarter	Billions of US Dollars
1991-04-01	0.08700
1994-10-01	0.01000
1995-01-01	0.02000
1995-07-01	0.00500
1999-01-01	0.00750
1999-04-01	0.05284
1999-07-01	0.00500
1999-10-01	0.05450
2000-01-01	0.03000
2000-04-01	0.08961
2000-07-01	0.00630
2000-10-01	0.56122
2001-01-01	1.75716
2001-04-01	0.06039
2001-07-01	0.95592
2001-10-01	0.45294
2002-01-01	0.22262
2002-04-01	0.59514
2002-07-01	0.03639
2002-10-01	0.49513
2003-01-01	0.12952
2003-04-01	0.14003
2003-07-01	0.26848
2003-10-01	0.10131
2004-01-01	0.00750
2004-07-01	0.02923
2005-01-01	0.29406
2005-04-01	0.40851
2005-07-01	0.35736
2005-10-01	0.27261
2006-01-01	0.15796
2006-04-01	0.03415
2007-01-01	0.05500
2007-04-01	0.43320
2007-07-01	0.28491
2007-10-01	0.06189
2008-01-01	0.03000
2008-04-01	0.04000
2009-10-01	0.00004
2011-07-01	0.00755
2013-01-01	0.00003
2014-04-01	0.00103
2015-04-01	0.01435