Quarter	Millions of US Dollars
1999-10-01	260001
2000-01-01	245908
2000-04-01	243739
2000-07-01	226134
2000-10-01	249274
2001-01-01	231818
2001-04-01	224709
2001-07-01	249863
2001-10-01	261425
2002-01-01	238040
2002-04-01	279167
2002-07-01	292262
2002-10-01	383376
2003-01-01	396074
2003-04-01	417369
2003-07-01	426113
2003-10-01	487101
2004-01-01	454980
2004-04-01	458672
2004-07-01	469955
2004-10-01	605839
2005-01-01	531344
2005-04-01	511325
2005-07-01	511145
2005-10-01	570325
2006-01-01	502708
2006-04-01	530284
2006-07-01	546550
2006-10-01	648066
2007-01-01	585452
2007-04-01	592563
2007-07-01	644519
2007-10-01	769687
2008-01-01	790974
2008-04-01	731304
2008-07-01	682701
2008-10-01	801427
2009-01-01	708025
2009-04-01	784575
2009-07-01	846370
2009-10-01	939023
2010-01-01	794654
2010-04-01	751946
2010-07-01	834302
2010-10-01	919065
2011-01-01	851050
2011-04-01	855404
2011-07-01	848985
2011-10-01	894805
2012-01-01	805835
2012-04-01	790502
2012-07-01	845309
2012-10-01	921822
2013-01-01	835903
2013-04-01	804121
2013-07-01	858993
2013-10-01	901696
2014-01-01	885651
2014-04-01	836393
2014-07-01	824182
2014-10-01	821924
2015-01-01	730468
2015-04-01	719495
2015-07-01	719089
2015-10-01	705595
2016-01-01	749339
2016-04-01	747120
2016-07-01	768067
2016-10-01	725547
2017-01-01	726377
2017-04-01	766577
2017-07-01	802848
2017-10-01	819150
2018-01-01	819046