Quarter	Billions of US Dollars
1987-01-01	0.0373
1987-04-01	0.0371
1987-07-01	0.0371
1987-10-01	0.0374
1988-01-01	0.0073
1988-04-01	0.0071
1991-04-01	0.0280
1991-07-01	0.0280
1991-10-01	0.0280
1992-01-01	0.0280
1992-04-01	0.0280
1992-07-01	0.0280
1992-10-01	0.0280
1993-01-01	0.0280
1993-04-01	0.0280
1993-07-01	0.0280
1993-10-01	0.0280
1994-01-01	0.0280
1994-04-01	0.0280
1994-07-01	0.0280
1994-10-01	0.0280
1995-01-01	0.0280
1995-04-01	0.0280
1995-07-01	0.0280
1995-10-01	0.0280
1996-01-01	0.0900
1996-04-01	0.1900
1996-07-01	0.2600
1996-10-01	0.3700
1997-01-01	0.3400
1997-04-01	1.4327
1997-07-01	1.6005
1997-10-01	1.6289
1998-01-01	1.6297
1998-04-01	1.6132
1998-07-01	1.6352
1998-10-01	1.7055
1999-01-01	2.1193
1999-04-01	2.1137
1999-07-01	2.2281
1999-10-01	2.2725
2000-01-01	2.2663
2000-04-01	2.1691
2000-07-01	2.0744
2000-10-01	2.4924
2001-01-01	2.5901
2001-04-01	2.7426
2001-07-01	2.8445
2001-10-01	2.9490
2002-01-01	2.9426
2002-04-01	5.1766
2002-07-01	5.6353
2002-10-01	6.8580
2003-01-01	6.8849
2003-04-01	6.9683
2003-07-01	7.1473
2003-10-01	8.4631
2004-01-01	10.2704
2004-04-01	10.3626
2004-07-01	11.8478
2004-10-01	14.0434
2005-01-01	14.0959
2005-04-01	14.7445
2005-07-01	15.6196
2005-10-01	15.4520
2006-01-01	16.8086
2006-04-01	17.0120
2006-07-01	17.4280
2006-10-01	18.7866
2007-01-01	19.2077
2007-04-01	19.1174
2007-07-01	19.8523
2007-10-01	19.9388
2008-01-01	21.4388
2008-04-01	20.9606
2008-07-01	20.7991
2008-10-01	20.4662
2009-01-01	20.0325
2009-04-01	20.1609
2009-07-01	25.7700
2009-10-01	24.6240
2010-01-01	25.1034
2010-04-01	26.2400
2010-07-01	29.2725
2010-10-01	30.1193
2011-01-01	30.0922
2011-04-01	29.6524
2011-07-01	30.1556
2011-10-01	30.1742
2012-01-01	31.6796
2012-04-01	34.3673
2012-07-01	35.3432
2012-10-01	34.3068
2013-01-01	32.3257
2013-04-01	34.8713
2013-07-01	34.8996
2013-10-01	34.6300
2014-01-01	34.6477
2014-04-01	34.7882
2014-07-01	32.7607
2014-10-01	33.0847
2015-01-01	36.9508
2015-04-01	36.8093