Quarter	Billions of US Dollars
1977-01-01	0.0419
1977-04-01	0.0428
1977-07-01	0.0433
1977-10-01	0.0475
1978-01-01	0.0494
1978-04-01	0.0482
1978-07-01	0.0516
1978-10-01	0.0547
1979-01-01	0.0535
1979-04-01	0.0541
1979-07-01	0.0574
1979-10-01	0.0578
1980-01-01	0.0515
1980-04-01	0.0569
1980-07-01	0.0552
1980-10-01	0.0510
1981-01-01	0.0476
1981-04-01	0.0418
1981-07-01	0.0431
1981-10-01	0.0443
1993-07-01	1.5000
1993-10-01	1.5000
1994-01-01	1.5000
1994-04-01	1.5000
1994-07-01	1.5000
1994-10-01	1.5000
1995-01-01	1.5000
1995-04-01	1.5000
1995-07-01	1.5000
1995-10-01	1.5000
1996-01-01	1.5000
1996-04-01	1.5000
1996-07-01	1.5000
1996-10-01	1.5000
1997-01-01	1.5000
1997-04-01	1.5000
1997-07-01	1.5000
1997-10-01	1.5000
1998-01-01	1.5000
1998-04-01	1.5000
1998-07-01	1.5000
1998-10-01	1.5000
1999-01-01	1.5000
1999-04-01	1.5000
1999-07-01	1.5000
1999-10-01	1.5000
2000-01-01	1.5000
2000-04-01	1.5000
2000-07-01	1.5000
2000-10-01	1.5000
2001-01-01	1.5000
2001-04-01	1.5000
2001-07-01	1.5000
2001-10-01	1.5000
2002-01-01	1.5000
2002-04-01	1.5000
2002-07-01	1.7300
2002-10-01	1.7300
2003-01-01	1.7300
2003-04-01	1.7300
2003-07-01	1.7300
2003-10-01	1.7300
2004-01-01	3.0300
2004-04-01	3.0300
2004-07-01	3.0300
2004-10-01	4.0300
2005-01-01	5.1050
2005-04-01	7.1050
2005-07-01	7.5050
2005-10-01	9.3100
2006-01-01	14.2225
2006-04-01	16.7697
2006-07-01	17.1354
2006-10-01	27.6343
2007-01-01	30.9403
2007-04-01	32.7980
2007-07-01	37.7845
2007-10-01	42.8311
2008-01-01	42.1040
2008-04-01	47.8388
2008-07-01	49.3609
2008-10-01	48.5439
2009-01-01	46.6209
2009-04-01	52.8744
2009-07-01	58.7427
2009-10-01	54.5237
2010-01-01	53.6088
2010-04-01	52.2138
2010-07-01	52.7744
2010-10-01	55.1011
2011-01-01	55.3676
2011-04-01	58.2339
2011-07-01	57.6824
2011-10-01	59.4150
2012-01-01	59.4490
2012-04-01	57.6723
2012-07-01	58.7522
2012-10-01	64.1009
2013-01-01	66.7595
2013-04-01	68.1055
2013-07-01	67.2431
2013-10-01	68.3475
2014-01-01	70.4649
2014-04-01	75.9639
2014-07-01	74.1638
2014-10-01	78.4916
2015-01-01	82.3936
2015-04-01	87.3241