Quarter	Millions of US Dollars
2010-04-01	24559
2010-07-01	30263
2010-10-01	25108
2011-01-01	34604
2011-04-01	36906
2011-07-01	28469
2011-10-01	22467
2012-01-01	25888
2012-04-01	26336
2012-07-01	26511
2012-10-01	25579
2013-01-01	27333
2013-04-01	27909
2013-07-01	27935
2013-10-01	32620
2014-01-01	30972
2014-04-01	28432
2014-07-01	7131
2014-10-01	6561
2015-01-01	5882
2015-04-01	6162
2015-07-01	6092
2015-10-01	6010
2016-01-01	5627
2016-04-01	4974
2016-07-01	5148
2016-10-01	4648
2017-01-01	5632
2017-04-01	5841
2017-07-01	5565
2017-10-01	5521
2018-01-01	5909