Quarter	Billions of US Dollars
1987-01-01	0.4048
1987-04-01	0.4047
1987-07-01	0.4046
1987-10-01	0.4056
1988-01-01	0.5033
1988-04-01	0.4846
1988-07-01	0.4844
1988-10-01	0.4948
1989-01-01	0.4944
1989-04-01	0.4942
1989-07-01	0.4264
1989-10-01	0.2470
1990-01-01	0.2400
1990-04-01	0.2000
1990-07-01	0.2000
1990-10-01	0.2000
1991-01-01	0.2000
1991-04-01	0.2000
1991-07-01	0.1400
1991-10-01	0.1000
1992-01-01	0.1000
1992-04-01	0.1000
1992-07-01	0.1000
1992-10-01	0.1000
1993-01-01	0.2500
1993-04-01	0.1000
1993-07-01	0.1642
1993-10-01	0.1751
1994-01-01	0.1631
1994-04-01	0.1350
1994-07-01	0.1347
1994-10-01	0.1365
1995-01-01	0.1298
1995-04-01	0.1591
1995-07-01	0.1300
1995-10-01	0.1300
1996-01-01	0.1300
1996-04-01	0.1300
1996-07-01	0.1300
1996-10-01	0.1300
1997-01-01	0.5058
1997-04-01	0.5208
1997-07-01	0.5892
1997-10-01	0.5805
1998-01-01	0.6145
1998-04-01	0.8209
1998-07-01	0.8563
1998-10-01	0.8802
1999-01-01	0.8446
1999-04-01	0.8849
1999-07-01	1.6932
1999-10-01	1.7521
2000-01-01	1.6140
2000-04-01	2.1029
2000-07-01	2.1797
2000-10-01	2.2400
2001-01-01	2.2489
2001-04-01	3.2224
2001-07-01	5.2006
2001-10-01	4.9582
2002-01-01	5.1752
2002-04-01	5.3565
2002-07-01	5.6179
2002-10-01	5.7686
2003-01-01	5.8222
2003-04-01	7.0542
2003-07-01	7.1772
2003-10-01	7.4267
2004-01-01	7.8948
2004-04-01	8.6992
2004-07-01	9.9134
2004-10-01	11.4433
2005-01-01	11.5281
2005-04-01	11.1948
2005-07-01	12.2453
2005-10-01	11.8727
2006-01-01	10.6973
2006-04-01	12.5033
2006-07-01	12.3773
2006-10-01	12.3346
2007-01-01	12.2489
2007-04-01	14.2418
2007-07-01	14.5613
2007-10-01	14.3471
2008-01-01	14.8793
2008-04-01	15.6457
2008-07-01	15.1728
2008-10-01	14.5502
2009-01-01	13.8804
2009-04-01	12.5783
2009-07-01	12.2200
2009-10-01	12.4198
2010-01-01	12.7144
2010-04-01	12.0434
2010-07-01	13.7162
2010-10-01	14.1407
2011-01-01	16.1742
2011-04-01	17.2824
2011-07-01	18.8446
2011-10-01	21.2397
2012-01-01	26.0514
2012-04-01	24.1951
2012-07-01	25.7994
2012-10-01	26.7824
2013-01-01	28.8197
2013-04-01	33.2197
2013-07-01	38.0961
2013-10-01	41.7270
2014-01-01	40.7981
2014-04-01	43.8387
2014-07-01	44.9281
2014-10-01	40.8382
2015-01-01	36.2588
2015-04-01	37.3836