Quarter	Millions of US Dollars
2010-04-01	8120
2010-07-01	9255
2010-10-01	9183
2011-01-01	10081
2011-04-01	10279
2011-07-01	7685
2011-10-01	6694
2012-01-01	7209
2012-04-01	7737
2012-07-01	8084
2012-10-01	8468
2013-01-01	7772
2013-04-01	7774
2013-07-01	7986
2013-10-01	8385
2014-01-01	7963
2014-04-01	7819
2014-07-01	7062
2014-10-01	6495
2015-01-01	5815
2015-04-01	6095
2015-07-01	6021
2015-10-01	5988
2016-01-01	5614
2016-04-01	4957
2016-07-01	5135
2016-10-01	4556
2017-01-01	5536
2017-04-01	5737
2017-07-01	5452
2017-10-01	5492
2018-01-01	5881