Quarter	Millions of US Dollars
2007-10-01	3411
2008-01-01	4000
2008-04-01	4049
2008-07-01	4036
2008-10-01	4947
2009-01-01	6414
2009-04-01	4078
2009-07-01	2717
2009-10-01	2516
2010-01-01	2426
2010-04-01	2075
2010-07-01	2162
2010-10-01	2037
2011-01-01	2153
2011-04-01	2595
2011-07-01	2073
2011-10-01	2176
2012-01-01	2210
2012-04-01	2517
2012-07-01	2887
2012-10-01	3735
2013-01-01	3887
2013-04-01	4459
2013-07-01	4567
2013-10-01	4249
2014-01-01	4168
2014-04-01	3960
2014-07-01	4223
2014-10-01	4414
2015-01-01	4524
2015-04-01	4298
2015-07-01	4383
2015-10-01	3929
2016-01-01	3629
2016-04-01	4304
2016-07-01	5437
2016-10-01	5891
2017-01-01	6970
2017-04-01	6990
2017-07-01	6905
2017-10-01	6468
2018-01-01	5298