Quarter	Millions of US Dollars
2011-01-01	100
2011-04-01	100
2011-07-01	100
2011-10-01	100
2012-01-01	100
2012-04-01	300
2012-07-01	300
2012-10-01	800
2013-01-01	1300
2013-04-01	1300
2013-07-01	1300
2013-10-01	1300
2014-01-01	1600
2014-04-01	1600
2014-07-01	2600
2014-10-01	2600
2015-01-01	2600
2015-04-01	2880
2015-07-01	2880
2015-10-01	2880
2016-01-01	3380
2016-04-01	3391
2016-07-01	3391
2016-10-01	2991
2017-01-01	3491
2017-04-01	3491
2017-07-01	3491
2017-10-01	3491
2018-01-01	4021
2018-04-01	4021