Quarter	Millions of US Dollars
2010-07-01	3070
2010-10-01	-2103
2011-01-01	3773
2011-04-01	-7046
2011-07-01	1510
2011-10-01	-3021
2012-01-01	2931
2012-04-01	1322
2012-07-01	4529
2012-10-01	2918
2013-01-01	2446
2013-04-01	1690
2013-07-01	2691
2013-10-01	-2202
2014-01-01	4933
2014-04-01	4676
2014-07-01	806
2014-10-01	812
2015-01-01	3350
2015-04-01	-118
2015-07-01	3053
2015-10-01	-1391
2016-01-01	5291
2016-04-01	-383
2016-07-01	2763
2016-10-01	-576
2017-01-01	2716
2017-04-01	1708
2017-07-01	3220
2017-10-01	1982
2018-01-01	3396