Quarter	Millions of US Dollars
2002-01-01	305883
2002-04-01	269752
2002-07-01	213325
2002-10-01	237492
2003-01-01	265592
2003-04-01	324342
2003-07-01	337752
2003-10-01	336664
2004-01-01	353022
2004-04-01	332550
2004-07-01	370196
2004-10-01	413950
2005-01-01	432644
2005-04-01	508901
2005-07-01	555995
2005-10-01	538372
2006-01-01	603565
2006-04-01	597000
2006-07-01	625061
2006-10-01	650909
2007-01-01	710556
2007-04-01	786428
2007-07-01	823762
2007-10-01	899837
2008-01-01	925732
2008-04-01	1048966
2008-07-01	847553
2008-10-01	754775
2009-01-01	756907
2009-04-01	937253
2009-07-01	1077057
2009-10-01	1168078
2010-01-01	1158050
2010-04-01	1220396
2010-07-01	1305506
2010-10-01	1390091
2011-01-01	1428142
2011-04-01	1562330
2011-07-01	1318200
2011-10-01	1357633
2012-01-01	1418609
2012-04-01	1337363
2012-07-01	1322246
2012-10-01	1377833
2013-01-01	1380950
2013-04-01	1273792
2013-07-01	1256031
2013-10-01	1264213
2014-01-01	1308778
2014-04-01	1416564
2014-07-01	1253833
2014-10-01	1244390
2015-01-01	1059156
2015-04-01	1156283
2015-07-01	950751
2015-10-01	994008
2016-01-01	1117888
2016-04-01	1285739
2016-07-01	1312708
2016-10-01	1385574
2017-01-01	1495058
2017-04-01	1467588
2017-07-01	1556697
2017-10-01	1538020
2018-01-01	1573758