Quarter	Millions of US Dollars
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	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	0
1984-04-01	0
1984-07-01	0
1984-10-01	3
1985-01-01	3
1985-04-01	3
1985-07-01	4
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	0
1987-01-01	18
1987-04-01	18
1987-07-01	18
1987-10-01	22
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	9
1989-01-01	8
1989-04-01	8
1989-07-01	8
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	38
1992-04-01	40
1992-07-01	49
1992-10-01	46
1993-01-01	6
1993-04-01	66
1993-07-01	60
1993-10-01	60
1994-01-01	60
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	0
1996-04-01	0
1996-07-01	0
1996-10-01	0
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	0
1998-01-01	27
1998-04-01	26
1998-07-01	74
1998-10-01	79
1999-01-01	44
1999-04-01	74
1999-07-01	33
1999-10-01	31
2000-01-01	30
2000-04-01	130
2000-07-01	130
2000-10-01	130
2001-01-01	130
2001-04-01	0
2001-07-01	14
2001-10-01	14
2002-01-01	79
2002-04-01	82
2002-07-01	81
2002-10-01	107
2003-01-01	42
2003-04-01	43
2003-07-01	39
2003-10-01	15
2004-01-01	24
2004-04-01	24
2004-07-01	9
2004-10-01	15
2005-01-01	31
2005-04-01	211
2005-07-01	210
2005-10-01	201
2006-01-01	182
2006-04-01	0
2006-07-01	0
2006-10-01	0
2007-01-01	10
2007-04-01	254
2007-07-01	294
2007-10-01	322
2008-01-01	386
2008-04-01	110
2008-07-01	163
2008-10-01	154
2009-01-01	181
2009-04-01	186
2009-07-01	202
2009-10-01	215
2010-01-01	282
2010-04-01	263
2010-07-01	250
2010-10-01	312
2011-01-01	168
2011-04-01	129
2011-07-01	75
2011-10-01	68
2012-01-01	119
2012-04-01	92
2012-07-01	119
2012-10-01	75
2013-01-01	28
2013-04-01	53
2013-07-01	61
2013-10-01	136
2014-01-01	131
2014-04-01	196
2014-07-01	315
2014-10-01	240
2015-01-01	240
2015-04-01	234
2015-07-01	176
2015-10-01	173
2016-01-01	178
2016-04-01	311
2016-07-01	220
2016-10-01	212
2017-01-01	214
2017-04-01	128
2017-07-01	193
2017-10-01	195
2018-01-01	258
2018-04-01	121