Quarter	Millions of US Dollars
1994-07-01	520
1997-07-01	198
1998-01-01	-2
1998-07-01	23
1998-10-01	40
1999-01-01	-6
1999-04-01	-39
1999-07-01	-5
1999-10-01	20
2000-01-01	-13
2000-04-01	-1
2000-07-01	-8
2000-10-01	-5
2001-01-01	-5
2001-04-01	10
2001-07-01	490
2001-10-01	-2
2002-01-01	5
2002-04-01	0
2002-07-01	-23
2002-10-01	28
2003-01-01	575
2003-04-01	-5
2003-07-01	-10
2003-10-01	-12
2004-01-01	-10
2004-07-01	-210
2005-01-01	-10
2005-04-01	-1030
2005-07-01	-47
2005-10-01	-25
2006-01-01	452
2006-07-01	-30
2006-10-01	250
2007-01-01	421
2007-04-01	175
2007-07-01	-10
2008-01-01	-10
2008-07-01	-10
2009-01-01	-60
2009-07-01	-10
2010-04-01	750
2011-01-01	40
2011-07-01	500
2011-10-01	250
2012-01-01	-147
2012-04-01	-205
2013-01-01	286
2013-04-01	1000
2013-07-01	-175
2013-10-01	250
2014-01-01	0
2014-04-01	1250
2014-07-01	250
2015-01-01	2500
2015-04-01	1000
2016-01-01	960
2016-07-01	501
2017-01-01	1200
2017-04-01	500
2017-07-01	-1
2018-01-01	1818