Quarter	Millions of US Dollars
2011-01-01	483752
2011-04-01	506700
2011-07-01	479429
2011-10-01	463670
2012-01-01	509046
2012-04-01	485816
2012-07-01	537781
2012-10-01	545637
2013-01-01	563385
2013-04-01	538367
2013-07-01	530048
2013-10-01	564618
2014-01-01	586742
2014-04-01	604287
2014-07-01	609650
2014-10-01	612404
2015-01-01	633214
2015-04-01	574198
2015-07-01	575621
2015-10-01	593844
2016-01-01	604193
2016-04-01	664666
2016-07-01	690175
2016-10-01	697958
2017-01-01	728552
2017-04-01	747481
2017-07-01	760351
2017-10-01	796728
2018-01-01	785688