Quarter	Millions of US Dollars
2004-01-01	59845
2004-04-01	28838
2004-07-01	32670
2004-10-01	64871
2005-01-01	104246
2005-04-01	110271
2005-07-01	115986
2005-10-01	125006
2006-01-01	135865
2006-04-01	142803
2006-07-01	153203
2006-10-01	173507
2007-01-01	191117
2007-04-01	210208
2007-07-01	217597
2007-10-01	232520
2008-01-01	249189
2008-04-01	264925
2008-07-01	257796
2008-10-01	237253
2009-01-01	220585
2009-04-01	240880
2009-07-01	262425
2009-10-01	273964
2010-01-01	278859
2010-04-01	273213
2010-07-01	295730
2010-10-01	318803
2011-01-01	352777
2011-04-01	372557
2011-07-01	337685
2011-10-01	349644
2012-01-01	381779
2012-04-01	369989
2012-07-01	404158
2012-10-01	438082
2013-01-01	453598
2013-04-01	462005
2013-07-01	485502
2013-10-01	505555
2014-01-01	483895
2014-04-01	504196
2014-07-01	459479
2014-10-01	372183
2015-01-01	404575
2015-04-01	413871
2015-07-01	381517
2015-10-01	351999
2016-01-01	379684
2016-04-01	393522
2016-07-01	399247
2016-10-01	423229
2017-01-01	453735
2017-04-01	453921
2017-07-01	478682
2017-10-01	490667
2018-01-01	495017