Quarter	Millions of US Dollars
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	0
1981-01-01	0
1981-04-01	10
1981-07-01	10
1981-10-01	11
1982-01-01	10
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	0
1986-10-01	0
1987-01-01	0
1987-04-01	62
1987-07-01	62
1987-10-01	62
1988-01-01	62
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	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
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	5
1993-10-01	15
1994-01-01	25
1994-04-01	35
1994-07-01	44
1994-10-01	54
1995-01-01	42
1995-04-01	55
1995-07-01	65
1995-10-01	35
1996-01-01	58
1996-04-01	87
1996-07-01	129
1996-10-01	263
1997-01-01	250
1997-04-01	245
1997-07-01	266
1997-10-01	462
1998-01-01	464
1998-04-01	389
1998-07-01	345
1998-10-01	22
1999-01-01	23
1999-04-01	23
1999-07-01	23
1999-10-01	23
2000-01-01	472
2000-04-01	3615
2000-07-01	3615
2000-10-01	3615
2001-01-01	3143
2001-04-01	147
2001-07-01	147
2001-10-01	150
2002-01-01	150
2002-04-01	5
2002-07-01	5
2002-10-01	2
2003-01-01	2
2003-04-01	0
2003-07-01	0
2003-10-01	2
2004-01-01	2
2004-04-01	2
2004-07-01	2
2004-10-01	0
2005-01-01	0
2005-04-01	740
2005-07-01	740
2005-10-01	740
2006-01-01	740
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	32
2008-04-01	2940
2008-07-01	3071
2008-10-01	3071
2009-01-01	3170
2009-04-01	333
2009-07-01	333
2009-10-01	333
2010-01-01	202
2010-04-01	131
2010-07-01	650
2010-10-01	650
2011-01-01	832
2011-04-01	832
2011-07-01	182
2011-10-01	250
2012-01-01	68
2012-04-01	68
2012-07-01	649
2012-10-01	581
2013-01-01	775
2013-04-01	775
2013-07-01	194
2013-10-01	576
2014-01-01	387
2014-04-01	397
2014-07-01	397
2014-10-01	664
2015-01-01	660
2015-04-01	650
2015-07-01	650
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	0
2017-10-01	0
2018-01-01	0
2018-04-01	0