Quarter	Millions of US Dollars
2008-04-01	-244
2008-07-01	765
2008-10-01	723
2009-01-01	335
2009-04-01	-82
2009-07-01	1527
2009-10-01	400
2010-01-01	1438
2010-04-01	1361
2010-07-01	1542
2010-10-01	1928
2011-01-01	1538
2011-04-01	1069
2011-07-01	2505
2011-10-01	1886
2012-01-01	733
2012-04-01	1677
2012-07-01	384
2012-10-01	560
2013-01-01	-82
2013-04-01	2171
2013-07-01	1793
2013-10-01	1040
2014-01-01	529
2014-04-01	2659
2014-07-01	1179
2014-10-01	4408
2015-01-01	-2297
2015-04-01	2287
2015-07-01	1876
2015-10-01	1950
2016-01-01	39
2016-04-01	4240
2016-07-01	4249