Quarter	Millions of US Dollars
2005-04-01	24
2005-07-01	55
2005-10-01	640
2006-01-01	60
2006-04-01	77
2006-07-01	92
2006-10-01	107
2007-01-01	87
2007-04-01	82
2010-04-01	1
2011-01-01	21
2011-07-01	2080
2011-10-01	728
2012-01-01	5028
2012-04-01	1204
2012-07-01	2451
2012-10-01	799
2013-01-01	2269
2013-04-01	306
2013-07-01	-1601
2013-10-01	-893
2014-01-01	-2708
2014-04-01	-495
2014-07-01	-305
2014-10-01	-202
2015-01-01	-120
2015-04-01	-337
2015-07-01	-406
2015-10-01	-272
2016-01-01	-184
2016-04-01	-62
2016-07-01	-249
2016-10-01	-60
2017-01-01	-161
2017-04-01	-3632
2017-07-01	-196
2017-10-01	-152
2018-01-01	-296
2018-04-01	-93