Quarter	Millions of US Dollars
1972-01-01	0
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	20
1979-07-01	20
1979-10-01	20
1980-01-01	20
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	15
1981-04-01	14
1981-07-01	39
1981-10-01	39
1982-01-01	55
1982-04-01	55
1982-07-01	30
1982-10-01	30
1983-01-01	20
1983-04-01	20
1983-07-01	20
1983-10-01	20
1984-01-01	0
1984-04-01	0
1984-07-01	0
1984-10-01	55
1985-01-01	76
1985-04-01	76
1985-07-01	76
1985-10-01	33
1986-01-01	15
1986-04-01	15
1986-07-01	41
1986-10-01	29
1987-01-01	109
1987-04-01	108
1987-07-01	82
1987-10-01	96
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	24
1989-10-01	43
1990-01-01	43
1990-04-01	43
1990-07-01	18
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	38
1992-04-01	40
1992-07-01	42
1992-10-01	40
1993-01-01	104
1993-04-01	114
1993-07-01	114
1993-10-01	107
1994-01-01	0
1994-04-01	0
1994-07-01	0
1994-10-01	0
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	2
1996-04-01	7
1996-07-01	2
1996-10-01	7
1997-01-01	0
1997-04-01	9
1997-07-01	9
1997-10-01	615
1998-01-01	614
1998-04-01	614
1998-07-01	614
1998-10-01	1
1999-01-01	1
1999-04-01	26
1999-07-01	26
1999-10-01	26
2000-01-01	26
2000-04-01	145
2000-07-01	188
2000-10-01	992
2001-01-01	1519
2001-04-01	1374
2001-07-01	1655
2001-10-01	1252
2002-01-01	832
2002-04-01	834
2002-07-01	557
2002-10-01	156
2003-01-01	446
2003-04-01	469
2003-07-01	431
2003-10-01	431
2004-01-01	33
2004-04-01	9
2004-07-01	0
2004-10-01	19
2005-01-01	408
2005-04-01	992
2005-07-01	1350
2005-10-01	1323
2006-01-01	969
2006-04-01	359
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	1078
2007-07-01	1078
2007-10-01	1078
2008-01-01	1078
2008-04-01	0
2008-07-01	0
2008-10-01	0
2009-01-01	0
2009-04-01	0
2009-07-01	0
2009-10-01	150
2010-01-01	572
2010-04-01	572
2010-07-01	572
2010-10-01	422
2011-01-01	150
2011-04-01	150
2011-07-01	430
2011-10-01	430
2012-01-01	280
2012-04-01	280
2012-07-01	0
2012-10-01	170
2013-01-01	170
2013-04-01	170
2013-07-01	170
2013-10-01	220
2014-01-01	1691
2014-04-01	1691
2014-07-01	1691
2014-10-01	1471
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	125
2016-10-01	425
2017-01-01	425
2017-04-01	613
2017-07-01	485
2017-10-01	563
2018-01-01	570
2018-04-01	376