Quarter	Billions of US Dollars
1987-01-01	0.0820
1987-04-01	0.0820
1987-07-01	0.0970
1987-10-01	0.0970
1988-01-01	0.0970
1988-04-01	0.0470
1988-07-01	0.0470
1988-10-01	0.0470
1989-01-01	0.0470
1989-04-01	0.0470
1989-07-01	0.0470
1989-10-01	0.0470
1990-01-01	0.0470
1990-04-01	0.0470
1990-07-01	0.0470
1990-10-01	0.0350
1991-01-01	0.0350
1991-04-01	0.0350
1991-07-01	0.0350
1991-10-01	0.0350
1992-01-01	0.0350
1992-04-01	0.0350
1992-07-01	0.0350
1992-10-01	0.0350
1993-01-01	0.0350
1993-04-01	0.0350
1993-07-01	0.0850
1993-10-01	0.0850
1994-01-01	0.0650
1994-04-01	0.0650
1994-07-01	0.0500
1994-10-01	0.0500
1995-01-01	0.0500
1995-04-01	0.0500
1995-07-01	0.0500
1995-10-01	0.0500
1996-01-01	0.0500
1996-04-01	0.0500
1996-07-01	0.0500
1996-10-01	0.0500
1997-01-01	0.0500
1997-04-01	0.0500
1997-07-01	0.0500
1997-10-01	0.2500
1998-01-01	0.2500
1998-04-01	0.3728
1998-07-01	0.3517
1998-10-01	0.3517
1999-01-01	0.5018
1999-04-01	0.5018
1999-07-01	0.5269
1999-10-01	0.5269
2000-01-01	0.7062
2000-04-01	0.7052
2000-07-01	0.6902
2000-10-01	1.0028
2001-01-01	0.9403
2001-04-01	0.9394
2001-07-01	1.3015
2001-10-01	1.3682
2002-01-01	1.6129
2002-04-01	1.6550
2002-07-01	1.7986
2002-10-01	2.2533
2003-01-01	2.4100
2003-04-01	2.5890
2003-07-01	2.7285
2003-10-01	2.7571
2004-01-01	3.2715
2004-04-01	3.3499
2004-07-01	3.3576
2004-10-01	3.2239
2005-01-01	3.3227
2005-04-01	3.1093
2005-07-01	2.9235
2005-10-01	2.8962
2006-01-01	2.6259
2006-04-01	2.6134
2006-07-01	2.6139
2006-10-01	2.4500
2007-01-01	2.2486
2007-04-01	2.2652
2007-07-01	2.2718
2007-10-01	2.3042
2008-01-01	2.2126
2008-04-01	2.1435
2008-07-01	2.2268
2008-10-01	2.1893
2009-01-01	1.8881
2009-04-01	1.8204
2009-07-01	1.9379
2009-10-01	1.9454
2010-01-01	1.9599
2010-04-01	3.0131
2010-07-01	3.0218
2010-10-01	3.0238
2011-01-01	3.0071
2011-04-01	3.5608
2011-07-01	3.6378
2011-10-01	3.7203
2012-01-01	3.8331
2012-04-01	5.0407
2012-07-01	5.0968
2012-10-01	7.5919
2013-01-01	7.6027
2013-04-01	7.9455
2013-07-01	8.1784
2013-10-01	9.9333
2014-01-01	9.8176
2014-04-01	11.3419
2014-07-01	11.1447
2014-10-01	11.0984
2015-01-01	15.9318
2015-04-01	15.1347