Quarter	Millions of US Dollars
2010-04-01	40
2010-07-01	33
2010-10-01	0
2011-01-01	5
2011-04-01	11
2011-07-01	10
2011-10-01	2
2012-01-01	4
2012-04-01	4
2012-07-01	4
2012-10-01	5
2013-01-01	10
2013-04-01	12
2013-07-01	16
2013-10-01	17
2014-01-01	14
2014-04-01	17
2014-07-01	19
2014-10-01	18
2015-01-01	13
2015-04-01	5
2015-07-01	0
2015-10-01	0
2016-01-01	1
2016-04-01	1
2016-07-01	1
2016-10-01	5
2017-01-01	6
2017-04-01	3
2017-07-01	3
2017-10-01	14
2018-01-01	9