Quarter	Millions of US Dollars
2010-07-01	1000
2010-10-01	1229
2011-01-01	2047
2011-04-01	2050
2011-07-01	2018
2011-10-01	2017
2012-01-01	2038
2012-04-01	2013
2012-07-01	2025
2012-10-01	1800
2013-01-01	1800
2013-04-01	1800
2013-07-01	1800
2013-10-01	1800
2014-01-01	1800
2014-04-01	1800
2014-07-01	1800
2014-10-01	1800
2015-01-01	1800
2015-04-01	1800
2015-07-01	800
2015-10-01	800
2016-01-01	800
2016-04-01	800
2016-07-01	800
2016-10-01	800
2017-01-01	800
2017-04-01	3400
2017-07-01	3400
2017-10-01	3400
2018-01-01	3200
2018-04-01	3200