Quarter	Millions of US Dollars
2010-07-01	3050
2010-10-01	3467
2011-01-01	955
2011-04-01	5604
2011-07-01	1741
2011-10-01	6707
2012-01-01	3591
2012-04-01	3631
2012-07-01	3445
2012-10-01	1109
2013-01-01	4244
2013-04-01	6280
2013-07-01	5564
2013-10-01	508
2014-01-01	5098
2014-04-01	279
2014-07-01	1180
2014-10-01	2843
2015-01-01	3335
2015-04-01	1934
2015-07-01	4143
2015-10-01	1071
2016-01-01	4484
2016-04-01	1728
2016-07-01	6677
2016-10-01	-2326
2017-01-01	4766
2017-04-01	820
2017-07-01	4523
2017-10-01	185
2018-01-01	5279