Quarter	Millions of US Dollars
2005-10-01	25126
2006-01-01	24552
2006-04-01	25208
2006-07-01	25819
2006-10-01	28331
2007-01-01	26876
2007-04-01	28217
2007-07-01	28651
2007-10-01	29641
2008-01-01	31472
2008-04-01	35112
2008-07-01	34285
2008-10-01	26700
2009-01-01	26782
2009-04-01	26299
2009-07-01	27208
2009-10-01	28177
2010-01-01	31239
2010-04-01	31174
2010-07-01	32902
2010-10-01	35189
2011-01-01	38094
2011-04-01	39875
2011-07-01	35045
2011-10-01	36501
2012-01-01	40550
2012-04-01	38412
2012-07-01	41803
2012-10-01	42231
2013-01-01	44660
2013-04-01	45351
2013-07-01	45511
2013-10-01	47977
2014-01-01	49523
2014-04-01	48143
2014-07-01	50104
2014-10-01	45899
2015-01-01	46141
2015-04-01	47152
2015-07-01	45205
2015-10-01	43799
2016-01-01	43001
2016-04-01	39934
2016-07-01	38870
2016-10-01	36769
2017-01-01	40429
2017-04-01	42544
2017-07-01	44062
2017-10-01	41230
2018-01-01	46866