Quarter	Millions of US Dollars
2000-01-01	41038
2000-04-01	45123
2000-07-01	49103
2000-10-01	51862
2001-01-01	53907
2001-04-01	57155
2001-07-01	65533
2001-10-01	68079
2002-01-01	68839
2002-04-01	72076
2002-07-01	73837
2002-10-01	77013
2003-01-01	75972
2003-04-01	78342
2003-07-01	82907
2003-10-01	87339
2004-01-01	89455
2004-04-01	89075
2004-07-01	97969
2004-10-01	106230
2005-01-01	108800
2005-04-01	108099
2005-07-01	112134
2005-10-01	114442
2006-01-01	119514
2006-04-01	129994
2006-07-01	132547
2006-10-01	140321
2007-01-01	145138
2007-04-01	152680
2007-07-01	158803
2007-10-01	166283
2008-01-01	178459
2008-04-01	183231
2008-07-01	169949
2008-10-01	167588
2009-01-01	158376
2009-04-01	171497
2009-07-01	181035
2009-10-01	185020
2010-01-01	189744
2010-04-01	192389
2010-07-01	209944
2010-10-01	218989
2011-01-01	226334
2011-04-01	242566
2011-07-01	237828
2011-10-01	240872
2012-01-01	270120
2012-04-01	272223
2012-07-01	296923
2012-10-01	294805
2013-01-01	315099
2013-04-01	318927
2013-07-01	326207
2013-10-01	331388
2014-01-01	336395
2014-04-01	352939
2014-07-01	368779
2014-10-01	349332
2015-01-01	332164
2015-04-01	353057
2015-07-01	320317
2015-10-01	322318
2016-01-01	332422
2016-04-01	342419
2016-07-01	338736
2016-10-01	326431
2017-01-01	357867
2017-04-01	376422
2017-07-01	397501
2017-10-01	412218
2018-01-01	431979