Quarter	Millions of US Dollars
2009-04-01	24650
2009-07-01	25712
2009-10-01	25483
2010-01-01	29734
2010-04-01	29574
2010-07-01	30833
2010-10-01	33678
2011-01-01	36400
2011-04-01	37609
2011-07-01	32919
2011-10-01	34441
2012-01-01	38043
2012-04-01	35970
2012-07-01	39227
2012-10-01	40099
2013-01-01	42340
2013-04-01	43067
2013-07-01	43537
2013-10-01	46446
2014-01-01	47945
2014-04-01	46694
2014-07-01	48751
2014-10-01	44621
2015-01-01	44798
2015-04-01	45416
2015-07-01	43927
2015-10-01	42876
2016-01-01	42047
2016-04-01	38901
2016-07-01	37820
2016-10-01	35872
2017-01-01	39488
2017-04-01	41397
2017-07-01	42903
2017-10-01	40162
2018-01-01	45381