Quarter	Millions of US Dollars
2008-01-01	14
2008-04-01	40
2008-07-01	50
2008-10-01	50
2009-01-01	50
2009-04-01	24
2009-07-01	24
2009-10-01	24
2010-01-01	24
2010-04-01	24
2010-07-01	24
2010-10-01	24
2011-01-01	24
2011-04-01	24
2011-07-01	14
2011-10-01	14
2012-01-01	514
2012-04-01	514
2012-07-01	500
2012-10-01	500
2013-01-01	1500
2013-04-01	1500
2013-07-01	1500
2013-10-01	1500
2014-01-01	2750
2014-04-01	3616
2014-07-01	3626
2014-10-01	3676
2015-01-01	4544
2015-04-01	4543
2015-07-01	4543
2015-10-01	4493
2016-01-01	5744
2016-04-01	5730
2016-07-01	5732
2016-10-01	5732
2017-01-01	8232
2017-04-01	7885
2017-07-01	7890
2017-10-01	7900
2018-01-01	7900
2018-04-01	7888