Quarter	Millions of US Dollars
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	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	0
1983-07-01	0
1983-10-01	0
1984-01-01	20
1984-04-01	70
1984-07-01	70
1984-10-01	106
1985-01-01	87
1985-04-01	37
1985-07-01	39
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	0
1987-01-01	0
1987-04-01	0
1987-07-01	0
1987-10-01	0
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	0
1989-01-01	0
1989-04-01	0
1989-07-01	0
1989-10-01	12
1990-01-01	13
1990-04-01	13
1990-07-01	14
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	0
1992-04-01	0
1992-07-01	0
1992-10-01	0
1993-01-01	0
1993-04-01	0
1993-07-01	4569
1993-10-01	4210
1994-01-01	4144
1994-04-01	2533
1994-07-01	2103
1994-10-01	2160
1995-01-01	1184
1995-04-01	974
1995-07-01	1187
1995-10-01	664
1996-01-01	722
1996-04-01	772
1996-07-01	282
1996-10-01	429
1997-01-01	284
1997-04-01	134
1997-07-01	264
1997-10-01	279
1998-01-01	253
1998-04-01	191
1998-07-01	150
1998-10-01	77
1999-01-01	129
1999-04-01	218
1999-07-01	302
1999-10-01	338
2000-01-01	357
2000-04-01	298
2000-07-01	194
2000-10-01	177
2001-01-01	152
2001-04-01	82
2001-07-01	62
2001-10-01	72
2002-01-01	62
2002-04-01	395
2002-07-01	388
2002-10-01	378
2003-01-01	596
2003-04-01	240
2003-07-01	249
2003-10-01	253
2004-01-01	39
2004-04-01	47
2004-07-01	61
2004-10-01	59
2005-01-01	57
2005-04-01	44
2005-07-01	11
2005-10-01	5
2006-01-01	1
2006-04-01	1
2006-07-01	0
2006-10-01	0
2007-01-01	200
2007-04-01	200
2007-07-01	200
2007-10-01	200
2008-01-01	0
2008-04-01	300
2008-07-01	300
2008-10-01	300
2009-01-01	300
2009-04-01	0
2009-07-01	0
2009-10-01	0
2010-01-01	250
2010-04-01	250
2010-07-01	250
2010-10-01	250
2011-01-01	250
2011-04-01	250
2011-07-01	250
2011-10-01	250
2012-01-01	250
2012-04-01	250
2012-07-01	250
2012-10-01	290
2013-01-01	350
2013-04-01	350
2013-07-01	350
2013-10-01	310
2014-01-01	0
2014-04-01	0
2014-07-01	0
2014-10-01	0
2015-01-01	0
2015-04-01	0
2015-07-01	0
2015-10-01	0
2016-01-01	0
2016-04-01	0
2016-07-01	0
2016-10-01	0
2017-01-01	0
2017-04-01	0
2017-07-01	500
2017-10-01	1000
2018-01-01	1000
2018-04-01	1000