Quarter	Millions of US Dollars
2008-01-01	23521
2008-04-01	20584
2008-07-01	20610
2008-10-01	17976
2009-01-01	21417
2009-04-01	25326
2009-07-01	26435
2009-10-01	28065
2010-01-01	27318
2010-04-01	27505
2010-07-01	31448
2010-10-01	32094
2011-01-01	32554
2011-04-01	34132
2011-07-01	31909
2011-10-01	31980
2012-01-01	34767
2012-04-01	34017
2012-07-01	39167
2012-10-01	36429
2013-01-01	36127
2013-04-01	32517
2013-07-01	32312
2013-10-01	30783
2014-01-01	29803
2014-04-01	31578
2014-07-01	29034
2014-10-01	28149
2015-01-01	29395
2015-04-01	26363
2015-07-01	22573
2015-10-01	21431
2016-01-01	24581
2016-04-01	25960
2016-07-01	27915