Quarter	Millions of US Dollars
2003-10-01	75473
2004-01-01	80484
2004-04-01	84229
2004-07-01	91355
2004-10-01	108934
2005-01-01	114636
2005-04-01	116909
2005-07-01	121846
2005-10-01	123390
2006-01-01	133063
2006-04-01	137409
2006-07-01	141766
2006-10-01	154361
2007-01-01	159720
2007-04-01	163993
2007-07-01	174454
2007-10-01	195559
2008-01-01	213555
2008-04-01	226043
2008-07-01	208203
2008-10-01	180171
2009-01-01	158550
2009-04-01	179389
2009-07-01	204815
2009-10-01	211300
2010-01-01	222590
2010-04-01	197620
2010-07-01	237728
2010-10-01	228809
2011-01-01	249826
2011-04-01	263303
2011-07-01	223603
2011-10-01	213350
2012-01-01	245793
2012-04-01	234738
2012-07-01	251946
2012-10-01	266112
2013-01-01	258825
2013-04-01	255833
2013-07-01	269066
2013-10-01	277235
2014-01-01	241962
2014-04-01	248443
2014-07-01	233199
2014-10-01	224725
2015-01-01	215657
2015-04-01	214631
2015-07-01	217461
2015-10-01	208128
2016-01-01	225662
2016-04-01	220708
2016-07-01	228338
2016-10-01	213117
2017-01-01	228599
2017-04-01	246100
2017-07-01	246013
2017-10-01	256606
2018-01-01	265629