Quarter	Millions of US Dollars
2005-04-01	2859
2005-07-01	1446
2005-10-01	172
2006-01-01	1216
2006-04-01	2217
2006-07-01	1025
2006-10-01	319
2007-01-01	2508
2007-04-01	2957
2007-07-01	3610
2007-10-01	-1736
2008-01-01	3261
2008-04-01	3178
2008-07-01	538
2008-10-01	4026
2009-01-01	2142
2009-04-01	5522
2009-07-01	5483
2009-10-01	1805
2010-01-01	4744
2010-04-01	934
2010-07-01	2783
2010-10-01	2291
2011-01-01	9022
2011-04-01	1542
2011-07-01	237
2011-10-01	4721
2012-01-01	5060
2012-04-01	2946
2012-07-01	3298
2012-10-01	5613
2013-01-01	2578
2013-04-01	3945
2013-07-01	3508
2013-10-01	4481
2014-01-01	7356
2014-04-01	2654
2014-07-01	487
2014-10-01	4390
2015-01-01	4102
2015-04-01	7819
2015-07-01	-1678
2015-10-01	2356
2016-01-01	5114
2016-04-01	5821
2016-07-01	-1831
2016-10-01	892
2017-01-01	4350
2017-04-01	5051
2017-07-01	971
2017-10-01	104
2018-01-01	4532