Quarter	Millions of US Dollars
1993-10-01	89
1994-01-01	97
1994-04-01	146
1994-07-01	147
1994-10-01	295
1995-01-01	310
1995-04-01	313
1995-07-01	296
1995-10-01	292
1996-01-01	289
1996-04-01	436
1996-07-01	535
1996-10-01	531
1997-01-01	676
1997-04-01	982
1997-07-01	978
1997-10-01	972
1998-01-01	970
1998-04-01	967
1998-07-01	969
1998-10-01	983
1999-01-01	979
1999-04-01	978
1999-07-01	990
1999-10-01	1428
2000-01-01	1008
2000-04-01	995
2000-07-01	992
2000-10-01	900
2001-01-01	900
2001-04-01	855
2001-07-01	755
2001-10-01	605
2002-01-01	585
2002-04-01	585
2002-07-01	585
2002-10-01	439
2003-01-01	439
2003-04-01	439
2003-07-01	439
2003-10-01	293
2004-01-01	793
2004-04-01	793
2004-07-01	793
2004-10-01	646
2005-01-01	1246
2005-04-01	1246
2005-07-01	1246
2005-10-01	1100
2006-01-01	1900
2006-04-01	1900
2006-07-01	1900
2006-10-01	2150
2007-01-01	2150
2007-04-01	2900
2007-07-01	2900
2007-10-01	2900
2008-01-01	2900
2008-04-01	2900
2008-07-01	2900
2008-10-01	2900
2009-01-01	2400
2009-04-01	2538
2009-07-01	2538
2009-10-01	2538
2010-01-01	1938
2010-04-01	1938
2010-07-01	1938
2010-10-01	1938
2011-01-01	1938
2011-04-01	1938
2011-07-01	1938
2011-10-01	1938
2012-01-01	1938
2012-04-01	1938
2012-07-01	1938
2012-10-01	1938
2013-01-01	1938
2013-04-01	1938
2013-07-01	1938
2013-10-01	1550
2014-01-01	1550
2014-04-01	3550
2014-07-01	3550
2014-10-01	4550
2015-01-01	4550
2015-04-01	4550
2015-07-01	5050
2015-10-01	5050
2016-01-01	4550
2016-04-01	4550
2016-07-01	4550
2016-10-01	6550
2017-01-01	6550
2017-04-01	5800
2017-07-01	5800
2017-10-01	8300
2018-01-01	8300
2018-04-01	8300