Quarter	Millions of US Dollars
2004-01-01	5238
2004-04-01	5499
2004-07-01	5747
2004-10-01	7664
2005-01-01	8065
2005-04-01	9610
2005-07-01	10517
2005-10-01	12911
2006-01-01	15759
2006-04-01	17390
2006-07-01	19854
2006-10-01	24769
2007-01-01	26736
2007-04-01	30726
2007-07-01	33947
2007-10-01	33960
2008-01-01	42941
2008-04-01	45332
2008-07-01	44172
2008-10-01	38816
2009-01-01	33869
2009-04-01	41487
2009-07-01	49924
2009-10-01	56694
2010-01-01	58941
2010-04-01	55618
2010-07-01	60508
2010-10-01	62496
2011-01-01	72693
2011-04-01	78292
2011-07-01	66300
2011-10-01	66753
2012-01-01	74856
2012-04-01	66878
2012-07-01	69232
2012-10-01	74703
2013-01-01	78872
2013-04-01	77800
2013-07-01	78478
2013-10-01	82882
2014-01-01	74596
2014-04-01	76920
2014-07-01	64777
2014-10-01	54479
2015-01-01	62857
2015-04-01	68080
2015-07-01	60070
2015-10-01	54405
2016-01-01	59980
2016-04-01	66493
2016-07-01	69704
2016-10-01	85255
2017-01-01	94023
2017-04-01	93676
2017-07-01	101715
2017-10-01	114197
2018-01-01	117197