Quarter	Millions of US Dollars
2008-01-01	5038
2008-04-01	5054
2008-07-01	4695
2008-10-01	3772
2009-01-01	3668
2009-04-01	4551
2009-07-01	4547
2009-10-01	4868
2010-01-01	5396
2010-04-01	5303
2010-07-01	6023
2010-10-01	6024
2011-01-01	6152
2011-04-01	6122
2011-07-01	5979
2011-10-01	6226
2012-01-01	6535
2012-04-01	7017
2012-07-01	7609
2012-10-01	7317
2013-01-01	7359
2013-04-01	7985
2013-07-01	7363
2013-10-01	7067
2014-01-01	7281
2014-04-01	6845
2014-07-01	7538
2014-10-01	7507
2015-01-01	7261
2015-04-01	7919
2015-07-01	13042
2015-10-01	13001
2016-01-01	13464
2016-04-01	13754
2016-07-01	13761
2016-10-01	12935
2017-01-01	13038
2017-04-01	13820
2017-07-01	14105
2017-10-01	15942
2018-01-01	16444