Quarter	Millions of US Dollars
1997-07-01	150
1997-10-01	150
1998-01-01	150
1998-04-01	150
1998-07-01	150
1998-10-01	150
1999-01-01	150
1999-04-01	150
1999-07-01	150
1999-10-01	150
2000-01-01	150
2000-04-01	150
2000-07-01	150
2000-10-01	150
2001-01-01	150
2001-04-01	150
2001-07-01	150
2001-10-01	475
2002-01-01	475
2002-04-01	475
2002-07-01	475
2002-10-01	475
2003-01-01	475
2003-04-01	475
2003-07-01	775
2003-10-01	775
2004-01-01	775
2004-04-01	775
2004-07-01	775
2004-10-01	1105
2005-01-01	1105
2005-04-01	1105
2005-07-01	1105
2005-10-01	1105
2006-01-01	1105
2006-04-01	1105
2006-07-01	1105
2006-10-01	1105
2007-01-01	1105
2007-04-01	1105
2007-07-01	955
2007-10-01	955
2008-01-01	955
2008-04-01	955
2008-07-01	955
2008-10-01	955
2009-01-01	955
2009-04-01	955
2009-07-01	955
2009-10-01	955
2010-01-01	955
2010-04-01	955
2010-07-01	955
2010-10-01	955
2011-01-01	955
2011-04-01	955
2011-07-01	955
2011-10-01	630
2012-01-01	630
2012-04-01	1330
2012-07-01	1330
2012-10-01	1330
2013-01-01	2030
2013-04-01	2030
2013-07-01	1730
2013-10-01	1730
2014-01-01	1730
2014-04-01	1730
2014-07-01	1730
2014-10-01	1730
2015-01-01	1730
2015-04-01	1730
2015-07-01	1730
2015-10-01	1730
2016-01-01	1730
2016-04-01	2430
2016-07-01	2430
2016-10-01	2430
2017-01-01	2430
2017-04-01	2930
2017-07-01	2930
2017-10-01	2930
2018-01-01	2930
2018-04-01	2930