Quarter	Millions of US Dollars
2009-10-01	200
2010-01-01	200
2010-04-01	200
2010-07-01	200
2010-10-01	200
2011-01-01	200
2011-04-01	700
2011-07-01	700
2011-10-01	700
2012-01-01	700
2012-04-01	700
2012-07-01	700
2012-10-01	700
2013-01-01	700
2013-04-01	700
2013-07-01	700
2013-10-01	700
2014-01-01	700
2014-04-01	700
2014-07-01	1200
2014-10-01	1000
2015-01-01	1000
2015-04-01	1000
2015-07-01	1000
2015-10-01	1000
2016-01-01	1000
2016-04-01	1000
2016-07-01	1000
2016-10-01	1000
2017-01-01	1000
2017-04-01	2100
2017-07-01	2100
2017-10-01	2100
2018-01-01	4332
2018-04-01	4266