Quarter	Millions of US Dollars
1999-10-01	259963
2000-01-01	245872
2000-04-01	243703
2000-07-01	226099
2000-10-01	249238
2001-01-01	231784
2001-04-01	224675
2001-07-01	249827
2001-10-01	261390
2002-01-01	238006
2002-04-01	279128
2002-07-01	292224
2002-10-01	341319
2003-01-01	349981
2003-04-01	368734
2003-07-01	375638
2003-10-01	431634
2004-01-01	396740
2004-04-01	399693
2004-07-01	411241
2004-10-01	528710
2005-01-01	451525
2005-04-01	429951
2005-07-01	427213
2005-10-01	481386
2006-01-01	408626
2006-04-01	428401
2006-07-01	440138
2006-10-01	537485
2007-01-01	463492
2007-04-01	464499
2007-07-01	513651
2007-10-01	634750
2008-01-01	639513
2008-04-01	575506
2008-07-01	536254
2008-10-01	640524
2009-01-01	538149
2009-04-01	594718
2009-07-01	643322
2009-10-01	742617
2010-01-01	599030
2010-04-01	562950
2010-07-01	652507
2010-10-01	715972
2011-01-01	658559
2011-04-01	650697
2011-07-01	658570
2011-10-01	714720
2012-01-01	678814
2012-04-01	630883
2012-07-01	678776
2012-10-01	745367
2013-01-01	669202
2013-04-01	643769
2013-07-01	696579
2013-10-01	730917
2014-01-01	715632
2014-04-01	669343
2014-07-01	661989
2014-10-01	668787
2015-01-01	590039
2015-04-01	577645
2015-07-01	573420
2015-10-01	566662
2016-01-01	585745
2016-04-01	580165
2016-07-01	602002
2016-10-01	564289
2017-01-01	566582
2017-04-01	598629
2017-07-01	633911
2017-10-01	653791
2018-01-01	665719