Quarter	Millions of US Dollars
2009-04-01	32520
2009-07-01	28266
2009-10-01	30239
2010-01-01	30925
2010-04-01	33480
2010-07-01	35378
2010-10-01	35657
2011-01-01	34561
2011-04-01	36286
2011-07-01	27722
2011-10-01	27795
2012-01-01	28823
2012-04-01	29713
2012-07-01	30282
2012-10-01	33078
2013-01-01	32387
2013-04-01	32015
2013-07-01	28462
2013-10-01	34037
2014-01-01	33103
2014-04-01	33587
2014-07-01	31179
2014-10-01	34870
2015-01-01	32965
2015-04-01	32266
2015-07-01	28686
2015-10-01	31489
2016-01-01	32255
2016-04-01	31840
2016-07-01	29902
2016-10-01	30735
2017-01-01	31667
2017-04-01	36124
2017-07-01	36474
2017-10-01	33421
2018-01-01	37744