Quarter	Millions of US Dollars
2004-01-01	5248
2004-04-01	5506
2004-07-01	5750
2004-10-01	7849
2005-01-01	8250
2005-04-01	9789
2005-07-01	10698
2005-10-01	13050
2006-01-01	15904
2006-04-01	17540
2006-07-01	20005
2006-10-01	24770
2007-01-01	26737
2007-04-01	30726
2007-07-01	33947
2007-10-01	33960
2008-01-01	43090
2008-04-01	45673
2008-07-01	44506
2008-10-01	39254
2009-01-01	34180
2009-04-01	42180
2009-07-01	50773
2009-10-01	57395
2010-01-01	59756
2010-04-01	55965
2010-07-01	60632
2010-10-01	62554
2011-01-01	72756
2011-04-01	78579
2011-07-01	66456
2011-10-01	66948
2012-01-01	75059
2012-04-01	66878
2012-07-01	69232
2012-10-01	74703
2013-01-01	78936
2013-04-01	77861
2013-07-01	78539
2013-10-01	82943
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	69706
2016-10-01	85257
2017-01-01	94024
2017-04-01	93847
2017-07-01	101716
2017-10-01	114371
2018-01-01	117372