Quarter	Millions of US Dollars
2005-01-01	23999
2005-04-01	30971
2005-07-01	32084
2005-10-01	31653
2006-01-01	37061
2006-04-01	38607
2006-07-01	41941
2006-10-01	46282
2007-01-01	52688
2007-04-01	55579
2007-07-01	51485
2007-10-01	54356
2008-01-01	62210
2008-04-01	65770
2008-07-01	58999
2008-10-01	50834
2009-01-01	45521
2009-04-01	48331
2009-07-01	43047
2009-10-01	40893
2010-01-01	40931
2010-04-01	52784
2010-07-01	57721
2010-10-01	61133
2011-01-01	66451
2011-04-01	71212
2011-07-01	75624
2011-10-01	69220
2012-01-01	79319
2012-04-01	75508
2012-07-01	81947
2012-10-01	79711
2013-01-01	73819
2013-04-01	69211
2013-07-01	66150
2013-10-01	66239
2014-01-01	64793
2014-04-01	65345
2014-07-01	75473
2014-10-01	79667
2015-01-01	64861
2015-04-01	53006
2015-07-01	44981
2015-10-01	48580
2016-01-01	50483
2016-04-01	45977
2016-07-01	41846
2016-10-01	39638
2017-01-01	40985
2017-04-01	41329
2017-07-01	40326
2017-10-01	44525
2018-01-01	46768