Quarter	Millions of US Dollars
1999-10-01	163453
2000-01-01	155094
2000-04-01	153975
2000-07-01	142710
2000-10-01	163507
2001-01-01	150864
2001-04-01	146281
2001-07-01	161317
2001-10-01	180103
2002-01-01	159668
2002-04-01	186406
2002-07-01	194703
2002-10-01	239793
2003-01-01	239077
2003-04-01	250944
2003-07-01	255677
2003-10-01	309819
2004-01-01	272964
2004-04-01	275847
2004-07-01	280853
2004-10-01	382091
2005-01-01	322369
2005-04-01	306262
2005-07-01	312682
2005-10-01	373913
2006-01-01	306175
2006-04-01	326132
2006-07-01	335604
2006-10-01	429747
2007-01-01	362066
2007-04-01	369467
2007-07-01	414028
2007-10-01	529080
2008-01-01	530152
2008-04-01	472194
2008-07-01	438460
2008-10-01	528610
2009-01-01	442061
2009-04-01	483844
2009-07-01	518239
2009-10-01	601579
2010-01-01	464621
2010-04-01	432745
2010-07-01	507312
2010-10-01	593225
2011-01-01	527096
2011-04-01	512149
2011-07-01	512069
2011-10-01	574466
2012-01-01	536705
2012-04-01	489122
2012-07-01	529374
2012-10-01	597187
2013-01-01	526321
2013-04-01	500180
2013-07-01	547571
2013-10-01	586606
2014-01-01	564951
2014-04-01	515688
2014-07-01	511029
2014-10-01	525266
2015-01-01	458616
2015-04-01	453015
2015-07-01	447352
2015-10-01	447789
2016-01-01	450803
2016-04-01	444800
2016-07-01	464035
2016-10-01	448232
2017-01-01	448296
2017-04-01	469810
2017-07-01	496103
2017-10-01	524306
2018-01-01	530925