Quarter	Millions of US Dollars
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	0
2008-04-01	0
2008-07-01	0
2008-10-01	0
2009-01-01	0
2009-04-01	16
2009-07-01	17
2009-10-01	17
2010-01-01	17
2017-10-01	0
2018-01-01	0
2018-04-01	0