Quarter	Millions of US Dollars
2001-10-01	205757
2002-01-01	209270
2002-04-01	238091
2002-07-01	247405
2002-10-01	258685
2003-01-01	296390
2003-04-01	315840
2003-07-01	335856
2003-10-01	365262
2004-01-01	359840
2004-04-01	361441
2004-07-01	378682
2004-10-01	422215
2005-01-01	414758
2005-04-01	386949
2005-07-01	400261
2005-10-01	405232
2006-01-01	430633
2006-04-01	455242
2006-07-01	462684
2006-10-01	506854
2007-01-01	525248
2007-04-01	541952
2007-07-01	568373
2007-10-01	604036
2008-01-01	655881
2008-04-01	672765
2008-07-01	622223
2008-10-01	540907
2009-01-01	529567
2009-04-01	589117
2009-07-01	681926
2009-10-01	669037
2010-01-01	692184
2010-04-01	630718
2010-07-01	700630
2010-10-01	699926
2011-01-01	743039
2011-04-01	755609
2011-07-01	723173
2011-10-01	723865
2012-01-01	755574
2012-04-01	725415
2012-07-01	780026
2012-10-01	777306
2013-01-01	803507
2013-04-01	800714
2013-07-01	849517
2013-10-01	865644
2014-01-01	872451
2014-04-01	858098
2014-07-01	812615
2014-10-01	785248
2015-01-01	730931
2015-04-01	764030
2015-07-01	745566
2015-10-01	742549
2016-01-01	793584
2016-04-01	762560
2016-07-01	745156
2016-10-01	709134
2017-01-01	753594
2017-04-01	776663
2017-07-01	800975
2017-10-01	802934
2018-01-01	790233