Quarter	Millions of US Dollars
1994-07-01	520
1997-07-01	-2
1998-01-01	-2
1998-07-01	-2
1999-01-01	-2
1999-07-01	-2
2000-01-01	-2
2000-07-01	-2
2001-01-01	-10
2001-07-01	490
2002-01-01	-10
2002-07-01	-10
2003-01-01	590
2003-07-01	-10
2004-01-01	-10
2004-07-01	-10
2005-01-01	-10
2005-04-01	-1030
2005-07-01	-47
2006-01-01	290
2006-07-01	-30
2007-01-01	-10
2007-07-01	-10
2008-01-01	-10
2008-07-01	-10
2009-01-01	-10
2009-07-01	-10
2010-04-01	750
2011-07-01	500
2011-10-01	250
2013-01-01	-14
2013-04-01	1000
2013-10-01	500
2014-04-01	1250
2014-07-01	250
2015-01-01	2500
2015-04-01	1000
2016-01-01	1000
2016-07-01	500
2017-01-01	1200
2017-04-01	500
2018-01-01	1818