Quarter	Millions of US Dollars
1999-07-01	150
1999-10-01	150
2000-01-01	200
2000-04-01	200
2000-07-01	200
2000-10-01	200
2001-01-01	200
2001-04-01	200
2001-07-01	554
2001-10-01	554
2002-01-01	554
2002-04-01	1054
2002-07-01	1354
2002-10-01	1805
2003-01-01	2154
2003-04-01	2154
2003-07-01	2154
2003-10-01	2154
2004-01-01	2154
2004-04-01	2154
2004-07-01	2440
2004-10-01	2440
2005-01-01	2440
2005-04-01	2815
2005-07-01	2815
2005-10-01	2815
2006-01-01	2815
2006-04-01	3215
2006-07-01	3290
2006-10-01	3290
2007-01-01	3240
2007-04-01	3240
2007-07-01	3240
2007-10-01	3240
2008-01-01	3240
2008-04-01	3240
2008-07-01	3240
2008-10-01	3240
2009-01-01	3240
2009-04-01	3240
2009-07-01	3240
2009-10-01	4040
2010-01-01	4040
2010-04-01	4040
2010-07-01	4040
2010-10-01	4040
2011-01-01	4693
2011-04-01	4693
2011-07-01	4040
2011-10-01	4040
2012-01-01	4040
2012-04-01	4040
2012-07-01	4040
2012-10-01	4840
2013-01-01	4840
2013-04-01	4840
2013-07-01	4840
2013-10-01	4840
2014-01-01	4840
2014-04-01	4840
2014-07-01	5640
2014-10-01	5640
2015-01-01	5640
2015-04-01	5640
2015-07-01	5640
2015-10-01	5640
2016-01-01	5640
2016-04-01	5640
2016-07-01	5640
2016-10-01	5640
2017-01-01	6241
2017-04-01	6241
2017-07-01	6241
2017-10-01	6241
2018-01-01	6241
2018-04-01	6241