Quarter	Billions of US Dollars
1997-07-01	1.20000
1997-10-01	3.38750
1998-01-01	3.20000
1998-04-01	3.20000
1998-07-01	3.20000
1998-10-01	3.20000
1999-01-01	3.20000
1999-04-01	3.38208
1999-07-01	3.54229
1999-10-01	3.43283
2000-01-01	3.45024
2000-04-01	3.45587
2000-07-01	3.45108
2000-10-01	3.45695
2001-01-01	3.46326
2001-04-01	3.47003
2001-07-01	3.37240
2001-10-01	3.37240
2002-01-01	3.45000
2002-04-01	3.45000
2002-07-01	3.45000
2002-10-01	3.35000
2003-01-01	3.35000
2003-04-01	3.60000
2003-07-01	3.65000
2003-10-01	3.65000
2004-01-01	3.65000
2004-04-01	3.65000
2004-07-01	3.05000
2004-10-01	3.05000
2005-01-01	3.05000
2005-04-01	3.05000
2005-07-01	3.05000
2005-10-01	3.06000
2006-01-01	3.06015
2006-04-01	3.07667
2006-07-01	3.15685
2006-10-01	3.00681
2007-01-01	3.07695
2007-04-01	3.14298
2007-07-01	2.69319
2007-10-01	2.52548
2008-01-01	2.68870
2008-04-01	2.63785
2008-07-01	2.43855
2008-10-01	2.42314
2009-01-01	2.30266
2009-04-01	2.31862
2009-07-01	2.33179
2009-10-01	2.34891
2010-01-01	2.18966
2010-04-01	1.88968
2010-07-01	1.93293
2010-10-01	1.92804
2011-01-01	1.81372
2011-04-01	1.79745
2011-07-01	1.78910
2011-10-01	1.76897
2012-01-01	1.77177
2012-04-01	1.73544
2012-07-01	1.74910
2012-10-01	0.38923
2013-01-01	0.38893
2013-04-01	0.38915
2013-07-01	0.51430
2013-10-01	0.51428
2014-01-01	0.45301
2014-04-01	0.44871
2014-07-01	0.43480
2014-10-01	1.17778
2015-01-01	1.16587
2015-04-01	1.17071