Quarter	Millions of US Dollars
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	0
2009-07-01	281
2009-10-01	281
2010-01-01	282
2010-04-01	283
2011-04-01	0
2011-07-01	0
2011-10-01	0
2012-01-01	0
2012-04-01	0
2012-07-01	0
2012-10-01	0
2013-01-01	0
2013-04-01	400
2013-07-01	400
2013-10-01	400
2014-01-01	400
2014-04-01	0
2014-07-01	0
2014-10-01	0
2015-01-01	0
2015-04-01	0
2015-07-01	0
2015-10-01	0
2016-01-01	305
2016-04-01	640
2016-07-01	865
2016-10-01	856
2017-01-01	1133
2017-04-01	801
2017-07-01	580
2017-10-01	715
2018-01-01	335
2018-04-01	835