Quarter	Millions of US Dollars
2008-01-01	10605
2008-04-01	8732
2008-07-01	8936
2008-10-01	8582
2009-01-01	9627
2009-04-01	10504
2009-07-01	11703
2009-10-01	13028
2010-01-01	13953
2010-04-01	14851
2010-07-01	18248
2010-10-01	20883
2011-01-01	21825
2011-04-01	23398
2011-07-01	23690
2011-10-01	25257
2012-01-01	27624
2012-04-01	28174
2012-07-01	30918
2012-10-01	30952
2013-01-01	31267
2013-04-01	31413
2013-07-01	33277
2013-10-01	32982
2014-01-01	31908
2014-04-01	34583
2014-07-01	32778
2014-10-01	36811
2015-01-01	33377
2015-04-01	35198
2015-07-01	33498
2015-10-01	35296
2016-01-01	37022
2016-04-01	42128
2016-07-01	46547