Quarter	Millions of US Dollars
2005-01-01	12507
2005-04-01	14573
2005-07-01	13969
2005-10-01	15072
2006-01-01	17455
2006-04-01	17800
2006-07-01	18822
2006-10-01	27241
2007-01-01	33878
2007-04-01	38899
2007-07-01	38080
2007-10-01	47960
2008-01-01	47449
2008-04-01	50610
2008-07-01	44915
2008-10-01	40483
2009-01-01	42323
2009-04-01	44683
2009-07-01	43935
2009-10-01	50517
2010-01-01	57788
2010-04-01	58993
2010-07-01	69624
2010-10-01	74189
2011-01-01	79764
2011-04-01	81106
2011-07-01	83112
2011-10-01	83435
2012-01-01	86574
2012-04-01	71960
2012-07-01	59679
2012-10-01	64448
2013-01-01	68532
2013-04-01	60429
2013-07-01	53659
2013-10-01	51760
2014-01-01	54744
2014-04-01	57579
2014-07-01	53956
2014-10-01	52974
2015-01-01	54417
2015-04-01	55027
2015-07-01	51907
2015-10-01	47046
2016-01-01	68085
2016-04-01	58446
2016-07-01	55006
2016-10-01	58478
2017-01-01	69669
2017-04-01	60487
2017-07-01	57234
2017-10-01	57736
2018-01-01	61345