Quarter	Millions of US Dollars
2004-04-01	376
2004-07-01	425
2004-10-01	27822
2005-01-01	1791
2005-04-01	1279
2005-07-01	1979
2005-10-01	1823
2006-01-01	2065
2006-04-01	-193
2006-07-01	1366
2006-10-01	1461
2007-01-01	2236
2007-04-01	2977
2007-07-01	1236
2007-10-01	312
2008-01-01	1593
2008-04-01	184
2008-07-01	2003
2008-10-01	39
2009-01-01	1216
2009-04-01	769
2009-07-01	7704
2009-10-01	5919
2010-01-01	588
2010-04-01	1080
2010-07-01	8966
2010-10-01	9846
2011-01-01	8573
2011-04-01	4134
2011-07-01	760
2011-10-01	9040
2012-01-01	2824
2012-04-01	2572
2012-07-01	-307
2012-10-01	7240
2013-01-01	-3556
2013-04-01	4863
2013-07-01	5502
2013-10-01	8603
2014-01-01	-2860
2014-04-01	1525
2014-07-01	137
2014-10-01	-1146
2015-01-01	18969
2015-04-01	2706
2015-07-01	1572
2015-10-01	2574
2016-01-01	5400
2016-04-01	-1158
2016-07-01	1153
2016-10-01	5232
2017-01-01	6505
2017-04-01	2624
2017-07-01	7690
2017-10-01	3898
2018-01-01	253