Quarter	Millions of US Dollars
2010-04-01	6492
2010-07-01	6301
2010-10-01	7637
2011-01-01	8691
2011-04-01	9795
2011-07-01	10148
2011-10-01	12956
2012-01-01	13585
2012-04-01	14368
2012-07-01	15733
2012-10-01	15825
2013-01-01	16037
2013-04-01	17980
2013-07-01	16611
2013-10-01	16569
2014-01-01	27376
2014-04-01	35924
2014-07-01	36860
2014-10-01	41182
2015-01-01	42476
2015-04-01	44041
2015-07-01	43425
2015-10-01	43938
2016-01-01	49095
2016-04-01	50463
2016-07-01	43034
2016-10-01	42988
2017-01-01	44268
2017-04-01	45559
2017-07-01	40196
2017-10-01	38372
2018-01-01	32126