Quarter	Millions of US Dollars
2001-10-01	85653
2002-01-01	88169
2002-04-01	96972
2002-07-01	102532
2002-10-01	108481
2003-01-01	133863
2003-04-01	140011
2003-07-01	148706
2003-10-01	164341
2004-01-01	157772
2004-04-01	156533
2004-07-01	164506
2004-10-01	182991
2005-01-01	173481
2005-04-01	151653
2005-07-01	153736
2005-10-01	156789
2006-01-01	154737
2006-04-01	162744
2006-07-01	158363
2006-10-01	174730
2007-01-01	165439
2007-04-01	163739
2007-07-01	160166
2007-10-01	168339
2008-01-01	172813
2008-04-01	159058
2008-07-01	149658
2008-10-01	126382
2009-01-01	114361
2009-04-01	131686
2009-07-01	147595
2009-10-01	147072
2010-01-01	151353
2010-04-01	135995
2010-07-01	153003
2010-10-01	166694
2011-01-01	165768
2011-04-01	165526
2011-07-01	145724
2011-10-01	152150
2012-01-01	153029
2012-04-01	148505
2012-07-01	157702
2012-10-01	165632
2013-01-01	185580
2013-04-01	180595
2013-07-01	189221
2013-10-01	195180
2014-01-01	195129
2014-04-01	191779
2014-07-01	182212
2014-10-01	181738
2015-01-01	166883
2015-04-01	175221
2015-07-01	168671
2015-10-01	174273
2016-01-01	174804
2016-04-01	169732
2016-07-01	159511
2016-10-01	155296
2017-01-01	159434
2017-04-01	164562
2017-07-01	162042
2017-10-01	165045
2018-01-01	159136