Quarter	Millions of US Dollars
2008-10-01	8906
2009-01-01	8717
2009-04-01	13320
2009-07-01	19161
2009-10-01	19239
2010-01-01	19968
2010-04-01	18759
2010-07-01	22130
2010-10-01	22642
2011-01-01	21763
2011-04-01	25311
2011-07-01	22520
2011-10-01	22076
2012-01-01	26891
2012-04-01	27313
2012-07-01	28595
2012-10-01	29651
2013-01-01	28169
2013-04-01	27298
2013-07-01	29233
2013-10-01	30487
2014-01-01	29231
2014-04-01	25775
2014-07-01	25028
2014-10-01	24198
2015-01-01	24613
2015-04-01	26135
2015-07-01	32407
2015-10-01	32045
2016-01-01	30297
2016-04-01	27510
2016-07-01	26105
2016-10-01	23941
2017-01-01	24398
2017-04-01	24698
2017-07-01	26469
2017-10-01	24092
2018-01-01	24396