Quarter	Millions of US Dollars
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	0
1979-07-01	0
1979-10-01	0
1980-01-01	0
1980-04-01	0
1980-07-01	0
1980-10-01	12
1981-01-01	12
1981-04-01	12
1981-07-01	12
1981-10-01	0
1982-01-01	0
1982-04-01	0
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	0
1984-10-01	0
1985-01-01	0
1985-04-01	0
1985-07-01	0
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	12
1986-10-01	12
1987-01-01	25
1987-04-01	25
1987-07-01	45
1987-10-01	45
1988-01-01	65
1988-04-01	65
1988-07-01	102
1988-10-01	102
1989-01-01	70
1989-04-01	70
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	207
1991-04-01	207
1991-07-01	207
1991-10-01	207
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	7
1994-07-01	7
1994-10-01	11
1995-01-01	11
1995-04-01	7
1995-07-01	143
1995-10-01	139
1996-01-01	139
1996-04-01	188
1996-07-01	52
1996-10-01	56
1997-01-01	56
1997-04-01	157
1997-07-01	157
1997-10-01	222
1998-01-01	222
1998-04-01	222
1998-07-01	228
1998-10-01	214
1999-01-01	414
1999-04-01	570
1999-07-01	594
1999-10-01	594
2000-01-01	610
2000-04-01	453
2000-07-01	438
2000-10-01	463
2001-01-01	397
2001-04-01	525
2001-07-01	750
2001-10-01	675
2002-01-01	655
2002-04-01	1196
2002-07-01	512
2002-10-01	362
2003-01-01	416
2003-04-01	433
2003-07-01	373
2003-10-01	373
2004-01-01	189
2004-04-01	47
2004-07-01	257
2004-10-01	157
2005-01-01	157
2005-04-01	332
2005-07-01	435
2005-10-01	631
2006-01-01	835
2006-04-01	665
2006-07-01	412
2006-10-01	212
2007-01-01	97
2007-04-01	389
2007-07-01	392
2007-10-01	396
2008-01-01	307
2008-04-01	182
2008-07-01	279
2008-10-01	275
2009-01-01	775
2009-04-01	829
2009-07-01	1115
2009-10-01	1116
2010-01-01	773
2010-04-01	547
2010-07-01	550
2010-10-01	550
2011-01-01	400
2011-04-01	401
2011-07-01	1
2011-10-01	1
2012-01-01	1061
2012-04-01	1060
2012-07-01	1060
2012-10-01	1060
2013-01-01	0
2013-04-01	600
2013-07-01	600
2013-10-01	600
2014-01-01	600
2014-04-01	0
2014-07-01	175
2014-10-01	275
2015-01-01	575
2015-04-01	573
2015-07-01	400
2015-10-01	919
2016-01-01	1147
2016-04-01	1147
2016-07-01	1147
2016-10-01	1232
2017-01-01	698
2017-04-01	1048
2017-07-01	1643
2017-10-01	1050
2018-01-01	1050
2018-04-01	1698