Quarter	Billions of US Dollars
1997-07-01	0.1500
1997-10-01	0.1500
1998-01-01	0.3000
1998-04-01	0.4691
1998-07-01	0.4746
1998-10-01	0.4747
1999-01-01	0.4687
1999-04-01	0.3660
1999-07-01	0.3682
1999-10-01	0.3642
2000-01-01	0.3611
2000-04-01	0.3611
2000-07-01	0.2060
2000-10-01	0.2095
2001-01-01	0.0564
2001-10-01	0.1500
2002-01-01	0.6750
2002-04-01	1.0250
2002-07-01	1.0250
2002-10-01	2.8373
2003-01-01	4.9934
2003-04-01	5.1514
2003-07-01	5.2798
2003-10-01	5.3710
2004-01-01	6.0004
2004-04-01	6.6293
2004-07-01	7.1981
2004-10-01	7.6011
2005-01-01	7.6750
2005-04-01	7.7019
2005-07-01	7.5976
2005-10-01	8.3659
2006-01-01	8.1883
2006-04-01	7.8274
2006-07-01	8.1545
2006-10-01	9.6707
2007-01-01	10.8862
2007-04-01	13.8520
2007-07-01	13.9283
2007-10-01	13.6492
2008-01-01	14.2583
2008-04-01	15.5841
2008-07-01	18.9261
2008-10-01	18.8783
2009-01-01	17.8765
2009-04-01	20.3043
2009-07-01	20.9189
2009-10-01	19.1480
2010-01-01	19.2499
2010-04-01	21.3623
2010-07-01	21.3921
2010-10-01	22.4544
2011-01-01	24.4710
2011-04-01	25.2052
2011-07-01	24.1776
2011-10-01	25.2284
2012-01-01	24.9751
2012-04-01	24.8571
2012-07-01	28.6795
2012-10-01	31.7539
2013-01-01	34.0234
2013-04-01	40.6784
2013-07-01	39.5270
2013-10-01	41.4673
2014-01-01	40.5492
2014-04-01	40.3234
2014-07-01	38.8648
2014-10-01	38.9733
2015-01-01	38.1051
2015-04-01	38.4511