Quarter	Millions of US Dollars
2001-07-01	0
2001-10-01	0
2002-01-01	0
2002-04-01	0
2002-07-01	0
2002-10-01	0
2003-01-01	0
2003-04-01	0
2003-07-01	0
2003-10-01	0
2004-01-01	0
2004-04-01	0
2004-07-01	0
2004-10-01	0
2005-01-01	0
2005-04-01	0
2005-07-01	150
2005-10-01	150
2006-01-01	150
2006-04-01	150
2010-04-01	0
2010-07-01	0
2010-10-01	0
2011-01-01	0
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	0
2013-07-01	0
2013-10-01	0
2014-01-01	0
2014-04-01	500
2014-07-01	500
2014-10-01	500
2015-01-01	500
2015-04-01	0
2015-07-01	0
2015-10-01	200
2016-01-01	200
2016-04-01	200
2016-07-01	200
2016-10-01	500
2017-01-01	500
2017-04-01	1100
2017-07-01	1020
2017-10-01	600
2018-01-01	600
2018-04-01	800