Quarter	Millions of US Dollars
1993-10-01	695
1994-01-01	695
1994-04-01	695
1994-07-01	695
1994-10-01	695
1995-01-01	695
1995-04-01	695
1995-07-01	745
1995-10-01	745
1996-01-01	745
1996-04-01	745
1996-07-01	745
1996-10-01	740
1997-01-01	740
1997-04-01	736
1997-07-01	836
1997-10-01	831
1998-01-01	831
1998-04-01	826
1998-07-01	826
1998-10-01	822
1999-01-01	822
1999-04-01	817
1999-07-01	817
1999-10-01	813
2000-01-01	813
2000-04-01	808
2000-07-01	808
2000-10-01	803
2001-01-01	803
2001-04-01	799
2001-07-01	799
2001-10-01	794
2002-01-01	875
2002-04-01	870
2002-07-01	720
2002-10-01	716
2003-01-01	716
2003-04-01	711
2003-07-01	711
2003-10-01	99
2004-01-01	64
2004-04-01	60
2004-07-01	60
2004-10-01	200
2005-01-01	200
2005-04-01	196
2005-07-01	150
2005-10-01	145
2006-01-01	145
2006-04-01	145
2006-07-01	145
2006-10-01	145
2007-01-01	145
2007-04-01	145
2007-07-01	145
2007-10-01	145
2008-01-01	145
2008-04-01	145
2008-07-01	145
2008-10-01	145
2009-01-01	145
2009-04-01	145
2009-07-01	145
2009-10-01	145
2010-01-01	145
2010-04-01	145
2010-07-01	145
2010-10-01	895
2011-01-01	895
2011-04-01	895
2011-07-01	895
2011-10-01	895
2012-01-01	895
2012-04-01	895
2012-07-01	895
2012-10-01	895
2013-01-01	895
2013-04-01	895
2013-07-01	895
2013-10-01	2145
2014-01-01	2145
2014-04-01	3145
2014-07-01	3145
2014-10-01	3145
2015-01-01	3145
2015-04-01	4645
2015-07-01	4645
2015-10-01	4395
2016-01-01	4395
2016-04-01	4395
2016-07-01	4395
2016-10-01	5395
2017-01-01	5395
2017-04-01	6395
2017-07-01	6395
2017-10-01	7395
2018-01-01	7395
2018-04-01	7395