Quarter	Millions of US Dollars
2010-07-01	1933
2010-10-01	-4286
2011-01-01	6680
2011-04-01	1754
2011-07-01	-2894
2011-10-01	-2902
2012-01-01	1151
2012-04-01	1327
2012-07-01	-810
2012-10-01	-787
2013-01-01	3496
2013-04-01	-917
2013-07-01	-561
2013-10-01	3987
2014-01-01	-565
2014-04-01	-2038
2014-07-01	-18956
2014-10-01	-210
2015-01-01	-245
2015-04-01	345
2015-07-01	-107
2015-10-01	137
2016-01-01	-696
2016-04-01	-462
2016-07-01	30
2016-10-01	-213
2017-01-01	883
2017-04-01	-144
2017-07-01	-444
2017-10-01	-139
2018-01-01	280