Quarter	Millions of US Dollars
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	0
1994-07-01	0
1994-10-01	0
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	0
1996-04-01	0
1996-07-01	0
1996-10-01	0
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	0
1998-01-01	0
1998-04-01	0
1998-07-01	0
1998-10-01	200
1999-01-01	200
1999-04-01	200
1999-07-01	200
1999-10-01	0
2000-01-01	0
2000-04-01	100
2000-07-01	100
2000-10-01	100
2001-01-01	100
2001-04-01	0
2001-07-01	0
2001-10-01	350
2002-01-01	350
2002-04-01	350
2002-07-01	350
2002-10-01	50
2003-01-01	0
2003-04-01	100
2003-07-01	100
2003-10-01	400
2004-01-01	400
2004-04-01	300
2004-07-01	300
2004-10-01	375
2005-01-01	0
2005-04-01	0
2005-07-01	150
2005-10-01	150
2006-01-01	301
2006-04-01	1059
2006-07-01	908
2006-10-01	1215
2007-01-01	1296
2007-04-01	1083
2007-07-01	1083
2007-10-01	1142
2008-01-01	1568
2008-04-01	1120
2008-07-01	1354
2008-10-01	2034
2009-01-01	1465
2009-04-01	2468
2009-07-01	3247
2009-10-01	2425
2010-01-01	3074
2010-04-01	2957
2010-07-01	2810
2010-10-01	3202
2011-01-01	4525
2011-04-01	3580
2011-07-01	2671
2011-10-01	2420
2012-01-01	485
2012-04-01	2735
2012-07-01	5653
2012-10-01	6119
2013-01-01	7000
2013-04-01	6455
2013-07-01	3493
2013-10-01	3702
2014-01-01	5552
2014-04-01	4350
2014-07-01	5100
2014-10-01	6838
2015-01-01	4169
2015-04-01	3493
2015-07-01	4317
2015-10-01	3271
2016-01-01	4150
2016-04-01	5355
2016-07-01	3844
2016-10-01	3909
2017-01-01	4068
2017-04-01	3708
2017-07-01	5410
2017-10-01	4113
2018-01-01	3053
2018-04-01	3379