Quarter	Millions of US Dollars
2010-04-01	38907
2010-07-01	46715
2010-10-01	44172
2011-01-01	51087
2011-04-01	45585
2011-07-01	41104
2011-10-01	33947
2012-01-01	38659
2012-04-01	38994
2012-07-01	44091
2012-10-01	45332
2013-01-01	43023
2013-04-01	46695
2013-07-01	49646
2013-10-01	48855
2014-01-01	48086
2014-04-01	52628
2014-07-01	50823
2014-10-01	51139
2015-01-01	49500
2015-04-01	49584
2015-07-01	52834
2015-10-01	50108
2016-01-01	54828
2016-04-01	51636
2016-07-01	55811
2016-10-01	52001
2017-01-01	54177
2017-04-01	59570
2017-07-01	65207
2017-10-01	67053
2018-01-01	71395