Quarter	Millions of US Dollars
2005-01-01	7323
2005-04-01	7693
2005-07-01	8781
2005-10-01	9919
2006-01-01	12760
2006-04-01	14458
2006-07-01	16530
2006-10-01	19036
2007-01-01	27926
2007-04-01	30210
2007-07-01	33656
2007-10-01	40603
2008-01-01	41318
2008-04-01	38134
2008-07-01	37840
2008-10-01	38249
2009-01-01	38574
2009-04-01	40971
2009-07-01	46273
2009-10-01	46947
2010-01-01	49066
2010-04-01	50895
2010-07-01	56930
2010-10-01	59008
2011-01-01	61353
2011-04-01	62678
2011-07-01	66278
2011-10-01	67912
2012-01-01	71089
2012-04-01	70717
2012-07-01	77272
2012-10-01	80120
2013-01-01	94461
2013-04-01	80959
2013-07-01	77512
2013-10-01	72039
2014-01-01	70915
2014-04-01	70772
2014-07-01	71474
2014-10-01	73633
2015-01-01	68435
2015-04-01	67508
2015-07-01	58205
2015-10-01	62283
2016-01-01	61732
2016-04-01	66888
2016-07-01	68428
2016-10-01	65260
2017-01-01	63168
2017-04-01	69235
2017-07-01	71199
2017-10-01	78331
2018-01-01	78548