Quarter	Millions of US Dollars
2008-01-01	47316
2008-04-01	41842
2008-07-01	43616
2008-10-01	37411
2009-01-01	42891
2009-04-01	46597
2009-07-01	46969
2009-10-01	50042
2010-01-01	49734
2010-04-01	46012
2010-07-01	54122
2010-10-01	52633
2011-01-01	56541
2011-04-01	63504
2011-07-01	62669
2011-10-01	59284
2012-01-01	69272
2012-04-01	66829
2012-07-01	73811
2012-10-01	66992
2013-01-01	73241
2013-04-01	71380
2013-07-01	74243
2013-10-01	69765
2014-01-01	67598
2014-04-01	73828
2014-07-01	69510
2014-10-01	66674
2015-01-01	68297
2015-04-01	69211
2015-07-01	64658
2015-10-01	60339
2016-01-01	65997
2016-04-01	71482
2016-07-01	77509