Quarter	Millions of US Dollars
1999-04-01	1000
1999-07-01	1000
1999-10-01	1000
2000-01-01	1000
2000-04-01	2400
2000-07-01	2400
2000-10-01	2400
2001-01-01	2400
2001-04-01	2400
2001-07-01	2400
2001-10-01	2400
2002-01-01	2400
2002-04-01	2400
2002-07-01	2400
2002-10-01	2400
2003-01-01	2400
2003-04-01	2400
2003-07-01	2400
2003-10-01	2400
2004-01-01	2400
2004-04-01	2400
2004-07-01	2400
2004-10-01	2400
2005-01-01	2400
2005-04-01	2400
2005-07-01	2400
2005-10-01	2400
2006-01-01	2400
2006-04-01	2400
2006-07-01	2400
2006-10-01	2400
2007-01-01	2400
2007-04-01	2400
2007-07-01	2400
2007-10-01	2400
2008-01-01	2400
2008-04-01	2400
2008-07-01	2400
2008-10-01	2400
2009-01-01	2400
2009-04-01	4400
2009-07-01	4400
2009-10-01	11400
2010-01-01	11400
2010-04-01	11949
2010-07-01	11949
2010-10-01	11949
2011-01-01	11949
2011-04-01	11949
2011-07-01	11949
2011-10-01	16949
2012-01-01	15949
2012-04-01	15949
2012-07-01	19949
2012-10-01	19949
2013-01-01	19949
2013-04-01	19949
2013-07-01	19949
2013-10-01	19949
2014-01-01	19949
2014-04-01	17949
2014-07-01	17949
2014-10-01	17949
2015-01-01	14449
2015-04-01	13900
2015-07-01	13900
2015-10-01	13900
2016-01-01	13900
2016-04-01	22900
2016-07-01	22900
2016-10-01	22900
2017-01-01	20900
2017-04-01	20900
2017-07-01	20900
2017-10-01	20900
2018-01-01	18900
2018-04-01	30900