Quarter	Millions of US Dollars
2005-01-01	25814
2005-04-01	24344
2005-07-01	16314
2005-10-01	15190
2006-01-01	13725
2006-04-01	8578
2006-07-01	13899
2006-10-01	8565
2007-01-01	8646
2007-04-01	11194
2007-07-01	8194
2007-10-01	8030
2008-01-01	5032
2008-04-01	4853
2008-07-01	10206
2008-10-01	11553
2009-01-01	11530
2009-04-01	12603
2009-07-01	14136
2009-10-01	12768
2010-01-01	12088
2010-04-01	9182
2010-07-01	6102
2010-10-01	6150
2011-01-01	4256
2011-04-01	3316
2011-07-01	360
2011-10-01	0
2012-01-01	0
2012-04-01	514
2012-07-01	1289
2012-10-01	2064
2013-01-01	1518
2013-04-01	1427
2013-07-01	0
2013-10-01	0
2014-01-01	0
2014-04-01	0
2014-07-01	0
2014-10-01	467
2015-01-01	790
2015-04-01	1375
2015-07-01	1470
2015-10-01	263
2016-01-01	1199
2016-04-01	1171
2016-07-01	1689
2016-10-01	961
2017-01-01	1162
2017-04-01	1099
2017-07-01	954
2017-10-01	540
2018-01-01	988