Quarter	Millions of US Dollars
1993-10-01	15
1994-01-01	55
1994-04-01	-10
1994-10-01	-10
1997-01-01	-50
1997-10-01	8
1998-04-01	-8
2003-10-01	40
2004-01-01	60
2011-10-01	250
2012-04-01	250
2013-04-01	500
2013-10-01	-40
2014-01-01	-60
2017-04-01	600