Quarter	Millions of US Dollars
1972-04-01	0
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
1975-04-01	0
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	0
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	25
1979-07-01	26
1979-10-01	26
1980-01-01	24
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	0
1981-04-01	0
1981-07-01	0
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	31
1983-07-01	30
1983-10-01	29
1984-01-01	31
1984-04-01	0
1984-07-01	33
1984-10-01	87
1985-01-01	88
1985-04-01	89
1985-07-01	60
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	32
1987-01-01	34
1987-04-01	384
1987-07-01	388
1987-10-01	420
1988-01-01	514
1988-04-01	327
1988-07-01	433
1988-10-01	498
1989-01-01	378
1989-04-01	152
1989-07-01	49
1989-10-01	138
1990-01-01	130
1990-04-01	132
1990-07-01	145
1990-10-01	0
1991-01-01	107
1991-04-01	156
1991-07-01	164
1991-10-01	1265
1992-01-01	1080
1992-04-01	1086
1992-07-01	2351
1992-10-01	1418
1993-01-01	1418
1993-04-01	2059
1993-07-01	1250
1993-10-01	1606
1994-01-01	1635
1994-04-01	1437
1994-07-01	1034
1994-10-01	430
1995-01-01	489
1995-04-01	0
1995-07-01	0
1995-10-01	200
1996-01-01	200
1996-04-01	300
1996-07-01	395
1996-10-01	182
1997-01-01	654
1997-04-01	607
1997-07-01	564
1997-10-01	530
1998-01-01	66
1998-04-01	66
1998-07-01	0
1998-10-01	0
1999-01-01	0
1999-04-01	0
1999-07-01	200
1999-10-01	200
2000-01-01	200
2000-04-01	200
2000-07-01	0
2000-10-01	0
2001-01-01	0
2001-04-01	0
2001-07-01	0
2001-10-01	0
2002-01-01	0
2002-04-01	0
2002-07-01	0
2002-10-01	650
2003-01-01	650
2003-04-01	650
2003-07-01	650
2003-10-01	0
2004-01-01	0
2004-04-01	0
2004-07-01	0
2004-10-01	885
2005-01-01	843
2005-04-01	786
2005-07-01	783
2005-10-01	0
2006-01-01	0
2006-04-01	0
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	0
2008-04-01	1500
2008-07-01	1632
2008-10-01	1607
2009-01-01	1604
2009-04-01	121
2009-07-01	0
2009-10-01	0
2010-01-01	0
2010-04-01	0
2010-07-01	1750
2010-10-01	1750
2011-01-01	1750
2011-04-01	1750
2011-07-01	0
2011-10-01	0
2012-01-01	0
2012-04-01	0
2012-07-01	0
2012-10-01	0
2013-01-01	0
2013-04-01	0
2013-07-01	0
2013-10-01	0
2014-01-01	0
2014-04-01	1250
2014-07-01	1250
2014-10-01	1250
2015-01-01	1250
2015-04-01	0
2015-07-01	1200
2015-10-01	1200
2016-01-01	1200
2016-04-01	1200
2016-07-01	0
2016-10-01	0
2017-01-01	0
2017-04-01	0
2017-07-01	0
2017-10-01	449
2018-01-01	458
2018-04-01	440