Quarter	Millions of US Dollars
1994-10-01	150
1996-04-01	150
1997-01-01	150
1997-04-01	300
1999-10-01	435
2000-01-01	-419
2000-04-01	-12
2001-10-01	-150
2002-01-01	-19
2002-04-01	0
2002-10-01	-146
2003-10-01	-146
2004-01-01	500
2004-10-01	-146
2005-10-01	-146
2006-01-01	800
2007-04-01	750
2009-01-01	-500
2014-04-01	2000
2014-10-01	1000
2015-07-01	500
2016-01-01	-500
2016-10-01	1000
2017-04-01	-750
2017-10-01	1500