Quarter	Millions of US Dollars
2008-04-01	2663
2008-07-01	6598
2008-10-01	-275
2009-01-01	4563
2009-04-01	1008
2009-07-01	5251
2009-10-01	-619
2010-01-01	3357
2010-04-01	181
2010-07-01	4661
2010-10-01	-1897
2011-01-01	8323
2011-04-01	7563
2011-07-01	8280
2011-10-01	-319
2012-01-01	7605
2012-04-01	2584
2012-07-01	4010
2012-10-01	-2528
2013-01-01	-295
2013-04-01	3551
2013-07-01	4246
2013-10-01	-762
2014-01-01	2267
2014-04-01	10619
2014-07-01	3350
2014-10-01	1573
2015-01-01	3542
2015-04-01	1350
2015-07-01	3087
2015-10-01	-3254
2016-01-01	4749
2016-04-01	9121
2016-07-01	11846