Quarter	Millions of US Dollars
2002-04-01	76497
2002-07-01	77607
2002-10-01	83457
2003-01-01	80390
2003-04-01	89044
2003-07-01	103066
2003-10-01	114880
2004-01-01	131108
2004-04-01	137123
2004-07-01	148160
2004-10-01	174000
2005-01-01	186690
2005-04-01	197841
2005-07-01	203833
2005-10-01	223220
2006-01-01	241760
2006-04-01	271455
2006-07-01	274100
2006-10-01	285767
2007-01-01	290708
2007-04-01	305138
2007-07-01	307576
2007-10-01	302202
2008-01-01	293303
2008-04-01	285749
2008-07-01	238400
2008-10-01	223391
2009-01-01	225173
2009-04-01	250942
2009-07-01	291241
2009-10-01	295985
2010-01-01	325095
2010-04-01	302551
2010-07-01	338358
2010-10-01	337271
2011-01-01	362173
2011-04-01	380039
2011-07-01	347776
2011-10-01	356836
2012-01-01	376429
2012-04-01	377238
2012-07-01	393686
2012-10-01	413371
2013-01-01	406857
2013-04-01	408067
2013-07-01	439776
2013-10-01	460797
2014-01-01	467481
2014-04-01	511133
2014-07-01	492832
2014-10-01	484543
2015-01-01	495493
2015-04-01	504749
2015-07-01	484874
2015-10-01	499069
2016-01-01	532317
2016-04-01	540383
2016-07-01	567341
2016-10-01	518485
2017-01-01	575263
2017-04-01	579653
2017-07-01	578952
2017-10-01	622039
2018-01-01	645126