Quarter	Millions of US Dollars
2008-04-01	2101
2008-07-01	4517
2008-10-01	-877
2009-01-01	2337
2009-04-01	-554
2009-07-01	1825
2009-10-01	-590
2010-01-01	1603
2010-04-01	-2237
2010-07-01	2489
2010-10-01	-3351
2011-01-01	5411
2011-04-01	5669
2011-07-01	5019
2011-10-01	-2672
2012-01-01	6155
2012-04-01	278
2012-07-01	1371
2012-10-01	-1071
2013-01-01	577
2013-04-01	2798
2013-07-01	2714
2013-10-01	-1551
2014-01-01	1222
2014-04-01	6194
2014-07-01	2030
2014-10-01	-2214
2015-01-01	3710
2015-04-01	1792
2015-07-01	2428
2015-10-01	-4131
2016-01-01	2666
2016-04-01	4029
2016-07-01	5744