Quarter	Millions of US Dollars
1983-07-01	38
1984-01-01	100
1985-04-01	196
1987-04-01	85
1988-07-01	-54
1988-10-01	83
1990-04-01	-46
1992-04-01	-93
1993-07-01	38
1993-10-01	-89
1994-01-01	20
1994-04-01	-156
1994-07-01	-111
1994-10-01	0
1995-01-01	-15
1995-04-01	-9
1995-07-01	60
1995-10-01	-10
1996-01-01	0
1996-04-01	5
1996-07-01	50
1996-10-01	0
1997-01-01	20
1997-04-01	-5
1997-07-01	730
1997-10-01	-5
1998-01-01	-5
1998-04-01	5
1998-07-01	-75
1998-10-01	94
1999-01-01	-2
1999-04-01	221
1999-10-01	100
2000-01-01	187
2000-04-01	5
2000-07-01	95
2001-01-01	0
2001-04-01	186
2001-07-01	-108
2001-10-01	58
2002-01-01	-15
2002-04-01	594
2002-07-01	-158
2002-10-01	-131
2003-01-01	577
2003-04-01	125
2003-07-01	294
2003-10-01	-27
2004-01-01	17
2004-04-01	575
2004-07-01	-624
2004-10-01	51
2005-01-01	79
2005-04-01	380
2005-07-01	383
2005-10-01	534
2006-01-01	452
2006-04-01	-252
2006-07-01	310
2006-10-01	-20
2007-01-01	0
2007-04-01	609
2007-07-01	190
2007-10-01	42
2008-01-01	-170
2008-04-01	-138
2008-07-01	-85
2008-10-01	-7
2009-01-01	-74
2009-04-01	498
2009-07-01	-76
2009-10-01	720
2010-01-01	1207
2010-04-01	737
2010-07-01	-33
2010-10-01	112
2011-01-01	-727
2011-04-01	-1
2011-07-01	-343
2011-10-01	1112
2012-01-01	54
2012-04-01	-39
2012-07-01	1495
2012-10-01	846
2013-01-01	-350
2013-04-01	509
2013-07-01	1426
2013-10-01	-118
2014-01-01	-18
2014-04-01	-611
2014-07-01	1241
2014-10-01	-356
2015-01-01	776
2015-04-01	-806
2015-07-01	0
2015-10-01	1000
2016-01-01	570
2016-04-01	0
2016-07-01	-265
2016-10-01	2400
2017-01-01	1700
2017-04-01	-591
2017-07-01	6434
2017-10-01	178
2018-01-01	0
2018-04-01	1880