Quarter	Millions of US Dollars
2001-10-01	112238
2002-01-01	113381
2002-04-01	131472
2002-07-01	133166
2002-10-01	141218
2003-01-01	154880
2003-04-01	167606
2003-07-01	178557
2003-10-01	193726
2004-01-01	195135
2004-04-01	196225
2004-07-01	204727
2004-10-01	229717
2005-01-01	230994
2005-04-01	224047
2005-07-01	235275
2005-10-01	240421
2006-01-01	266285
2006-04-01	281665
2006-07-01	293338
2006-10-01	322359
2007-01-01	348462
2007-04-01	364263
2007-07-01	393322
2007-10-01	420613
2008-01-01	467355
2008-04-01	492312
2008-07-01	454174
2008-10-01	402080
2009-01-01	402653
2009-04-01	444000
2009-07-01	520587
2009-10-01	511717
2010-01-01	531488
2010-04-01	485049
2010-07-01	538007
2010-10-01	524513
2011-01-01	567248
2011-04-01	579102
2011-07-01	566382
2011-10-01	561899
2012-01-01	591472
2012-04-01	564077
2012-07-01	610633
2012-10-01	598408
2013-01-01	606491
2013-04-01	607982
2013-07-01	648430
2013-10-01	658132
2014-01-01	663996
2014-04-01	652417
2014-07-01	618286
2014-10-01	593581
2015-01-01	554514
2015-04-01	575879
2015-07-01	563984
2015-10-01	556561
2016-01-01	604930
2016-04-01	579185
2016-07-01	572526
2016-10-01	541927
2017-01-01	581469
2017-04-01	597752
2017-07-01	624609
2017-10-01	624421
2018-01-01	616651