Quarter	Millions of US Dollars
1978-01-01	25
1978-04-01	44
1979-01-01	30
1979-07-01	46
1980-04-01	46
1981-07-01	43
1983-01-01	-21
1983-07-01	40
1984-01-01	55
1984-07-01	42
1985-01-01	60
1985-04-01	40
1985-10-01	295
1986-04-01	-59
1986-07-01	-58
1988-04-01	-80
1988-07-01	248
1989-04-01	-72
1989-07-01	200
1990-01-01	-145
1990-04-01	-300
1990-07-01	-69
1991-07-01	-73
1991-10-01	-77
1992-01-01	300
1993-01-01	170
1993-07-01	-119
1994-01-01	235
1994-04-01	54
1994-07-01	70
1994-10-01	18
1995-01-01	90
1995-04-01	70
1995-07-01	53
1995-10-01	-78
1996-01-01	283
1996-04-01	-22
1996-07-01	-72
1996-10-01	261
1997-01-01	-116
1997-04-01	600
1997-07-01	-85
1998-01-01	0
1998-04-01	100
1998-07-01	0
1998-10-01	-100
1999-04-01	40
1999-07-01	-240
2000-01-01	-187
2000-04-01	373
2000-07-01	-364
2000-10-01	290
2001-01-01	-8
2001-04-01	195
2001-07-01	44
2001-10-01	11
2002-01-01	-440
2002-04-01	0
2002-07-01	1238
2002-10-01	-300
2003-01-01	-28
2003-04-01	213
2003-07-01	-413
2003-10-01	172
2004-01-01	-558
2004-04-01	900
2004-07-01	66
2004-10-01	242
2005-01-01	-1
2005-04-01	728
2005-07-01	-843
2005-10-01	-100
2006-01-01	-80
2006-04-01	500
2006-07-01	187
2006-10-01	-714
2007-01-01	-4
2007-04-01	-1600
2007-10-01	-212
2008-01-01	-150
2008-04-01	-230
2008-10-01	-42
2009-01-01	-167
2009-10-01	-134
2011-04-01	-306
2013-04-01	-202
2015-04-01	-32
2015-07-01	100
2015-10-01	-50
2016-01-01	50
2016-07-01	121
2017-01-01	-109
2017-07-01	-20
2018-01-01	-130