Quarter	Millions of US Dollars
2001-07-01	1500
2001-10-01	1500
2002-01-01	1500
2002-04-01	1500
2002-07-01	1500
2002-10-01	1500
2003-01-01	1500
2003-04-01	1500
2003-07-01	1500
2003-10-01	1500
2004-01-01	1500
2004-04-01	1500
2004-07-01	1500
2004-10-01	1500
2005-01-01	1500
2005-04-01	1500
2005-07-01	2750
2005-10-01	2750
2006-01-01	2750
2006-04-01	2750
2006-07-01	2250
2006-10-01	2250
2007-01-01	2250
2007-04-01	2250
2007-07-01	3326
2007-10-01	3340
2008-01-01	3352
2008-04-01	3377
2008-07-01	3350
2008-10-01	3340
2009-01-01	3316
2009-04-01	3324
2009-07-01	3343
2009-10-01	3346
2010-01-01	3343
2010-04-01	4806
2010-07-01	4806
2010-10-01	4786
2011-01-01	4758
2011-04-01	4757
2011-07-01	3758
2011-10-01	3747
2012-01-01	3746
2012-04-01	3742
2012-07-01	2750
2012-10-01	2750
2013-01-01	2750
2013-04-01	5450
2013-07-01	6450
2013-10-01	6450
2014-01-01	6450
2014-04-01	6450
2014-07-01	6450
2014-10-01	3750
2015-01-01	3750
2015-04-01	5387
2015-07-01	4137
2015-10-01	5181
2016-01-01	5181
2016-04-01	5181
2016-07-01	4181
2016-10-01	8339
2017-01-01	10418
2017-04-01	12046
2017-07-01	12046
2017-10-01	10728
2018-01-01	13531
2018-04-01	18257