Quarter	Millions of US Dollars
2010-04-01	7857
2010-07-01	10300
2010-10-01	9104
2011-01-01	11937
2011-04-01	11391
2011-07-01	8826
2011-10-01	7526
2012-01-01	9935
2012-04-01	9273
2012-07-01	10510
2012-10-01	11888
2013-01-01	12746
2013-04-01	13810
2013-07-01	14825
2013-10-01	15026
2014-01-01	18606
2014-04-01	17659
2014-07-01	14473
2014-10-01	11683
2015-01-01	12516
2015-04-01	11618
2015-07-01	11787
2015-10-01	10797
2016-01-01	14531
2016-04-01	14989
2016-07-01	15502
2016-10-01	14766
2017-01-01	16743
2017-04-01	17510
2017-07-01	17318
2017-10-01	18852
2018-01-01	19573