Quarter	Millions of US Dollars
2010-07-01	-32
2010-10-01	95
2011-01-01	3
2011-04-01	98
2011-07-01	46
2011-10-01	27
2012-01-01	13
2012-04-01	-41
2012-07-01	13
2012-10-01	28
2013-01-01	41
2013-04-01	-106
2013-07-01	11
2013-10-01	-289
2014-01-01	6
2014-04-01	-45
2014-07-01	21
2014-10-01	4
2015-01-01	-29
2015-04-01	-2
2015-07-01	-13
2015-10-01	-4
2016-01-01	0
2016-04-01	96
2016-07-01	85
2016-10-01	18
2017-01-01	13
2017-04-01	23
2017-07-01	307
2017-10-01	80
2018-01-01	96