Quarter	Millions of US Dollars
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	0
1999-01-01	0
1999-04-01	0
1999-07-01	0
1999-10-01	0
2000-01-01	0
2000-04-01	0
2000-07-01	0
2000-10-01	0
2001-01-01	73
2001-04-01	73
2001-07-01	109
2001-10-01	109
2002-01-01	73
2002-04-01	73
2002-07-01	36
2002-10-01	36
2003-01-01	73
2003-04-01	73
2003-07-01	109
2003-10-01	109
2004-01-01	73
2004-04-01	73
2004-07-01	73
2004-10-01	73
2005-01-01	73
2005-04-01	73
2005-07-01	73
2005-10-01	73
2006-01-01	36
2006-04-01	36
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	0
2008-04-01	1000
2008-07-01	1745
2008-10-01	1745
2009-01-01	1825
2009-04-01	825
2009-07-01	160
2009-10-01	914
2010-01-01	914
2010-04-01	1564
2010-07-01	1564
2010-10-01	810
2011-01-01	810
2011-04-01	160
2011-07-01	960
2011-10-01	1960
2012-01-01	880
2012-04-01	880
2012-07-01	160
2012-10-01	160
2013-01-01	160
2013-04-01	2241
2013-07-01	3894
2013-10-01	3984
2014-01-01	7480
2014-04-01	6049
2014-07-01	5775
2014-10-01	6867
2015-01-01	3577
2015-04-01	3183
2015-07-01	2678
2015-10-01	1945
2016-01-01	3753
2016-04-01	4137
2016-07-01	3563
2016-10-01	4522
2017-01-01	5120
2017-04-01	4637
2017-07-01	4369
2017-10-01	3500
2018-01-01	845
2018-04-01	1971