Quarter	Millions of US Dollars
2008-04-01	806
2008-07-01	1316
2008-10-01	-121
2009-01-01	1891
2009-04-01	1644
2009-07-01	1899
2009-10-01	-429
2010-01-01	316
2010-04-01	1057
2010-07-01	630
2010-10-01	-474
2011-01-01	1374
2011-04-01	825
2011-07-01	756
2011-10-01	467
2012-01-01	717
2012-04-01	629
2012-07-01	2255
2012-10-01	-2017
2013-01-01	-790
2013-04-01	-1418
2013-07-01	-261
2013-10-01	-251
2014-01-01	516
2014-04-01	1766
2014-07-01	141
2014-10-01	-621
2015-01-01	2129
2015-04-01	-2729
2015-07-01	-1217
2015-10-01	-1073
2016-01-01	2044
2016-04-01	852
2016-07-01	1853