Quarter	Millions of US Dollars
1978-07-01	25
1978-10-01	25
1979-01-01	25
1979-04-01	25
1979-07-01	25
1979-10-01	25
1980-01-01	25
1980-04-01	25
1980-07-01	25
1980-10-01	25
1981-01-01	25
1981-04-01	25
1981-07-01	25
1981-10-01	25
1982-01-01	25
1982-04-01	25
1982-07-01	25
1982-10-01	25
1983-01-01	25
1983-04-01	25
1997-10-01	15
1998-01-01	15
1998-04-01	4
1998-07-01	4
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	694
2002-04-01	1194
2002-07-01	1494
2002-10-01	1945
2003-01-01	2294
2003-04-01	2294
2003-07-01	2294
2003-10-01	2294
2004-01-01	2294
2004-04-01	2294
2004-07-01	2580
2004-10-01	2580
2005-01-01	2580
2005-04-01	2955
2005-07-01	2955
2005-10-01	2955
2006-01-01	2955
2006-04-01	3355
2006-07-01	3430
2006-10-01	3430
2007-01-01	3380
2007-04-01	3380
2007-07-01	3380
2007-10-01	3380
2008-01-01	3380
2008-04-01	3380
2008-07-01	3380
2008-10-01	3380
2009-01-01	3380
2009-04-01	3380
2009-07-01	3380
2009-10-01	4180
2010-01-01	4180
2010-04-01	4040
2010-07-01	4490
2010-10-01	4490
2011-01-01	5143
2011-04-01	5143
2011-07-01	4490
2011-10-01	4490
2012-01-01	4490
2012-04-01	4490
2012-07-01	4490
2012-10-01	5290
2013-01-01	5290
2013-04-01	5304
2013-07-01	5304
2013-10-01	5304
2014-01-01	5304
2014-04-01	5304
2014-07-01	6104
2014-10-01	6104
2015-01-01	6104
2015-04-01	5940
2015-07-01	5940
2015-10-01	5940
2016-01-01	5940
2016-04-01	5940
2016-07-01	5940
2016-10-01	5940
2017-01-01	6891
2017-04-01	6891
2017-07-01	6891
2017-10-01	6891
2018-01-01	6891
2018-04-01	6891