Quarter	Millions of US Dollars
1976-07-01	367
1976-10-01	379
1977-01-01	379
1977-04-01	379
1977-07-01	379
1977-10-01	379
1978-01-01	379
1978-04-01	379
1978-07-01	379
1978-10-01	379
1979-01-01	379
1979-04-01	379
1979-07-01	379
1979-10-01	379
1980-01-01	379
1980-04-01	379
1980-07-01	379
1980-10-01	379
1981-01-01	379
1981-04-01	379
1981-07-01	379
1981-10-01	367
1982-01-01	367
1982-04-01	367
1982-07-01	367
1982-10-01	367
1983-01-01	367
1983-04-01	367
1983-07-01	367
1983-10-01	367
1984-01-01	367
1984-04-01	367
1984-07-01	367
1984-10-01	367
1985-01-01	367
1985-04-01	367
1985-07-01	367
1985-10-01	367
1986-01-01	367
1986-04-01	367
1986-07-01	367
1986-10-01	367
1987-01-01	367
1987-04-01	367
1987-07-01	355
1987-10-01	355
1988-01-01	342
1988-04-01	342
1988-07-01	310
1988-10-01	310
1989-01-01	277
1989-04-01	277
1989-07-01	207
1989-10-01	207
1990-01-01	207
1990-04-01	207
1990-07-01	207
1990-10-01	207
1991-01-01	207
1991-04-01	207
1991-07-01	207
1991-10-01	207
1993-07-01	100
1993-10-01	540
1994-01-01	540
1994-04-01	946
1994-07-01	1138
1994-10-01	1256
1995-01-01	1253
1995-04-01	1247
1995-07-01	1644
1995-10-01	1758
1996-01-01	1830
1996-04-01	2272
1996-07-01	2295
1996-10-01	2925
1997-01-01	3649
1997-04-01	3905
1997-07-01	3886
1997-10-01	3844
1998-01-01	3975
1998-04-01	4263
1998-07-01	4354
1998-10-01	4156
1999-01-01	4152
1999-04-01	4322
1999-07-01	4747
1999-10-01	4548
2000-01-01	4846
2000-04-01	4892
2000-07-01	4851
2000-10-01	4627
2001-01-01	4386
2001-04-01	4384
2001-07-01	4433
2001-10-01	4429
2002-01-01	4276
2002-04-01	5926
2002-07-01	5234
2002-10-01	5087
2003-01-01	5153
2003-04-01	5825
2003-07-01	5754
2003-10-01	5765
2004-01-01	5746
2004-04-01	5590
2004-07-01	5651
2004-10-01	5577
2005-01-01	5570
2005-04-01	5561
2005-07-01	5810
2005-10-01	5802
2006-01-01	6110
2006-04-01	5944
2006-07-01	5692
2006-10-01	5996
2007-01-01	5802
2007-04-01	5790
2007-07-01	5817
2007-10-01	5836
2008-01-01	6053
2008-04-01	5738
2008-07-01	5743
2008-10-01	5799
2009-01-01	5777
2009-04-01	6620
2009-07-01	6555
2009-10-01	7153
2010-01-01	6909
2010-04-01	6889
2010-07-01	6602
2010-10-01	7364
2011-01-01	7815
2011-04-01	8694
2011-07-01	8297
2011-10-01	8294
2012-01-01	8597
2012-04-01	8609
2012-07-01	8617
2012-10-01	8611
2013-01-01	9041
2013-04-01	10857
2013-07-01	10855
2013-10-01	11236
2014-01-01	11234
2014-04-01	10949
2014-07-01	10860
2014-10-01	10852
2015-01-01	10854
2015-04-01	10557
2015-07-01	10668
2015-10-01	10567
2016-01-01	10276
2016-04-01	10265
2016-07-01	10252
2016-10-01	9623
2017-01-01	9090
2017-04-01	9088
2017-07-01	9084
2017-10-01	8391
2018-01-01	8890
2018-04-01	8738