Quarter	Millions of US Dollars
1999-10-01	164813
2000-01-01	155304
2000-04-01	154119
2000-07-01	142941
2000-10-01	163900
2001-01-01	151398
2001-04-01	147062
2001-07-01	162439
2001-10-01	181372
2002-01-01	159913
2002-04-01	186657
2002-07-01	195021
2002-10-01	240263
2003-01-01	239351
2003-04-01	250945
2003-07-01	256359
2003-10-01	311519
2004-01-01	272965
2004-04-01	275849
2004-07-01	280889
2004-10-01	382186
2005-01-01	322556
2005-04-01	306471
2005-07-01	312954
2005-10-01	374167
2006-01-01	306509
2006-04-01	326549
2006-07-01	336502
2006-10-01	430948
2007-01-01	362542
2007-04-01	369864
2007-07-01	414905
2007-10-01	530462
2008-01-01	531562
2008-04-01	475391
2008-07-01	442561
2008-10-01	533149
2009-01-01	442526
2009-04-01	491718
2009-07-01	528982
2009-10-01	632957
2010-01-01	487359
2010-04-01	448921
2010-07-01	521231
2010-10-01	596927
2011-01-01	531669
2011-04-01	515101
2011-07-01	514782
2011-10-01	576257
2012-01-01	539762
2012-04-01	490325
2012-07-01	530653
2012-10-01	597693
2013-01-01	526818
2013-04-01	500812
2013-07-01	548204
2013-10-01	587253
2014-01-01	565012
2014-04-01	516326
2014-07-01	512378
2014-10-01	526400
2015-01-01	459835
2015-04-01	453358
2015-07-01	447990
2015-10-01	449846
2016-01-01	455691
2016-04-01	445285
2016-07-01	464492
2016-10-01	448726
2017-01-01	448853
2017-04-01	470369
2017-07-01	496867
2017-10-01	525196
2018-01-01	531813