Quarter	Millions of US Dollars
1982-01-01	42
1983-07-01	60
1984-01-01	21
1984-07-01	20
1985-01-01	340
1985-07-01	21
1991-01-01	-37
1991-07-01	-97
1993-04-01	141
1993-07-01	140
1993-10-01	544
1994-01-01	157
1994-04-01	68
1994-07-01	160
1994-10-01	200
1995-04-01	85
1995-07-01	291
1995-10-01	46
1996-01-01	240
1996-04-01	753
1996-07-01	536
1996-10-01	454
1997-01-01	172
1997-04-01	37
1997-07-01	190
1997-10-01	93
1998-01-01	-43
1998-07-01	-70
1998-10-01	300
1999-01-01	-236
1999-04-01	174
1999-07-01	-205
1999-10-01	-3
2000-04-01	-69
2000-07-01	-169
2000-10-01	-195
2001-01-01	-186
2001-04-01	-220
2001-07-01	-145
2001-10-01	-313
2002-01-01	-51
2002-04-01	-13
2002-07-01	-24
2002-10-01	48
2003-04-01	-160
2003-07-01	-140
2003-10-01	-433
2004-01-01	-210
2004-04-01	-305
2004-07-01	340
2005-01-01	-195
2005-04-01	565
2005-07-01	650
2005-10-01	302
2006-01-01	-22
2006-04-01	-260
2006-07-01	10
2006-10-01	65
2007-01-01	-100
2007-04-01	541
2007-07-01	200
2007-10-01	-111
2008-04-01	150
2008-10-01	-383
2010-10-01	-270
2011-01-01	328
2011-07-01	-110
2012-01-01	0
2012-04-01	0
2012-07-01	528
2012-10-01	850
2013-01-01	666
2013-04-01	7
2013-07-01	500
2013-10-01	-265
2014-01-01	290
2014-04-01	1000
2014-07-01	-313
2014-10-01	0
2015-04-01	-650
2015-10-01	-6
2016-07-01	964
2017-04-01	415
2017-07-01	1659
2017-10-01	-500