Quarter	Millions of US Dollars
1996-10-01	75
1997-10-01	-5
1999-10-01	-70
2005-07-01	500
2006-07-01	150
2006-10-01	200
2007-04-01	125
2009-01-01	-14
2009-07-01	-14
2010-01-01	-14
2010-07-01	-14
2011-01-01	-14
2011-07-01	-14
2011-10-01	574
2012-01-01	250
2012-07-01	-464
2013-01-01	1300
2013-07-01	-29
2014-01-01	-14
2014-07-01	-14
2015-01-01	925
2015-07-01	-29
2017-04-01	-250