Quarter	Millions of US Dollars
2009-04-01	35627
2009-07-01	37944
2009-10-01	38970
2010-01-01	41943
2010-04-01	42149
2010-07-01	39981
2010-10-01	44631
2011-01-01	45731
2011-04-01	54799
2011-07-01	46614
2011-10-01	50578
2012-01-01	57698
2012-04-01	63109
2012-07-01	66134
2012-10-01	63156
2013-01-01	68162
2013-04-01	66029
2013-07-01	63185
2013-10-01	73561
2014-01-01	73159
2014-04-01	74010
2014-07-01	69017
2014-10-01	69355
2015-01-01	67733
2015-04-01	66208
2015-07-01	58627
2015-10-01	50248
2016-01-01	41983
2016-04-01	40001
2016-07-01	39863
2016-10-01	37556
2017-01-01	43245
2017-04-01	49807
2017-07-01	49966
2017-10-01	45790
2018-01-01	47366