Quarter	Millions of US Dollars
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	740
1998-01-01	740
1998-04-01	740
1998-07-01	740
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	690
2001-04-01	709
2001-07-01	709
2001-10-01	709
2002-01-01	954
2002-04-01	936
2002-07-01	973
2002-10-01	965
2003-01-01	947
2003-04-01	947
2003-07-01	910
2003-10-01	0
2004-01-01	67
2004-04-01	67
2004-07-01	67
2004-10-01	67
2005-01-01	100
2005-04-01	100
2005-07-01	100
2005-10-01	100
2006-01-01	703
2006-04-01	805
2006-07-01	1787
2006-10-01	1787
2007-01-01	2526
2007-04-01	2424
2007-07-01	1442
2007-10-01	1442
2008-01-01	0
2008-04-01	0
2008-07-01	0
2008-10-01	0
2009-01-01	0
2009-04-01	740
2009-07-01	759
2009-10-01	750
2010-01-01	717
2010-04-01	0
2010-07-01	0
2010-10-01	0
2011-01-01	13
2011-04-01	13
2011-07-01	13
2011-10-01	13
2012-01-01	0
2012-04-01	0
2012-07-01	0
2012-10-01	0
2013-01-01	0
2013-04-01	0
2013-07-01	0
2013-10-01	516
2014-01-01	1040
2014-04-01	1036
2014-07-01	1005
2014-10-01	524
2015-01-01	0
2015-04-01	1223
2015-07-01	1223
2015-10-01	1223
2016-01-01	1223
2016-04-01	0
2016-07-01	0
2016-10-01	0
2017-01-01	0
2017-04-01	0
2017-07-01	0
2017-10-01	0
2018-01-01	1000
2018-04-01	1000