Quarter	Millions of US Dollars
1993-10-01	73
1994-01-01	147
1994-04-01	340
1994-07-01	-155
1994-10-01	312
1995-01-01	-419
1995-04-01	52
1995-07-01	242
1995-10-01	109
1996-01-01	78
1996-04-01	-123
1996-07-01	-252
1996-10-01	106
1997-01-01	-112
1997-04-01	89
1997-07-01	71
1997-10-01	-144
1998-01-01	28
1998-04-01	26
1998-07-01	-57
1998-10-01	-107
1999-01-01	-76
1999-04-01	-43
1999-07-01	-30
1999-10-01	19
2000-01-01	-6
2000-04-01	22
2000-07-01	16
2000-10-01	-28
2001-01-01	22
2001-04-01	59
2001-07-01	7
2001-10-01	-37
2002-01-01	-72
2002-04-01	127
2002-07-01	-17
2002-10-01	6
2003-01-01	2
2003-04-01	0
2003-07-01	194
2003-10-01	23
2004-01-01	3
2004-04-01	200
2004-07-01	12
2004-10-01	-12
2005-01-01	-14
2005-04-01	8
2005-07-01	0
2005-10-01	-16
2006-01-01	-7
2006-04-01	-33
2006-07-01	3
2006-10-01	-4
2007-01-01	-2
2007-04-01	-9
2007-07-01	3
2007-10-01	2
2008-01-01	-1
2008-04-01	94
2008-07-01	-1
2008-10-01	3
2009-01-01	-3
2009-04-01	1
2009-07-01	-2
2009-10-01	598
2010-01-01	-4
2010-04-01	-1
2011-07-01	-200
2011-10-01	69
2012-04-01	225
2012-10-01	650
2014-01-01	300
2014-07-01	1047
2017-01-01	550
2017-10-01	400
2018-04-01	647