Quarter	Millions of US Dollars
2011-01-01	100
2012-04-01	200
2012-10-01	500
2013-01-01	500
2014-01-01	300
2014-07-01	1000
2015-04-01	280
2016-01-01	500
2016-04-01	11
2016-10-01	-400
2017-01-01	500
2018-01-01	530