Quarter	Millions of US Dollars
1993-07-01	60
1996-07-01	-12
1997-01-01	-12
1997-07-01	150
1997-10-01	-12
1998-01-01	-12
1998-07-01	-12
2001-10-01	325
2003-07-01	300
2004-10-01	430
2007-07-01	-150
2008-04-01	35
2011-07-01	150
2011-10-01	-325
2012-01-01	200
2012-04-01	700
2012-10-01	500
2013-01-01	700
2013-04-01	100
2013-07-01	-300
2014-01-01	800
2014-10-01	-100
2016-04-01	1050
2017-01-01	-300
2017-04-01	500