Quarter	Millions of US Dollars
2002-01-01	101213
2002-04-01	86385
2002-07-01	59589
2002-10-01	58645
2003-01-01	60685
2003-04-01	66379
2003-07-01	66211
2003-10-01	64293
2004-01-01	66578
2004-04-01	65635
2004-07-01	71181
2004-10-01	79395
2005-01-01	87363
2005-04-01	108544
2005-07-01	122368
2005-10-01	128099
2006-01-01	143791
2006-04-01	154174
2006-07-01	162380
2006-10-01	176473
2007-01-01	190186
2007-04-01	207608
2007-07-01	234728
2007-10-01	254403
2008-01-01	286387
2008-04-01	365460
2008-07-01	358188
2008-10-01	315609
2009-01-01	322737
2009-04-01	391787
2009-07-01	421939
2009-10-01	428937
2010-01-01	428034
2010-04-01	436876
2010-07-01	488538
2010-10-01	539259
2011-01-01	604738
2011-04-01	673327
2011-07-01	602742
2011-10-01	627488
2012-01-01	653201
2012-04-01	589323
2012-07-01	605173
2012-10-01	598721
2013-01-01	620652
2013-04-01	580383
2013-07-01	581052
2013-10-01	572282
2014-01-01	617002
2014-04-01	669641
2014-07-01	613584
2014-10-01	583589
2015-01-01	488239
2015-04-01	522536
2015-07-01	415186
2015-10-01	442254
2016-01-01	493815
2016-04-01	564253
2016-07-01	567933
2016-10-01	568355
2017-01-01	566870
2017-04-01	536515
2017-07-01	549782
2017-10-01	515272
2018-01-01	504209