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	1728
2010-10-01	973
2011-01-01	973
2011-04-01	323
2011-07-01	960
2011-10-01	1960
2012-01-01	1018
2012-04-01	1080
2012-07-01	496
2012-10-01	2558
2013-01-01	3232
2013-04-01	7050
2013-07-01	8038
2013-10-01	8650
2014-01-01	13016
2014-04-01	10616
2014-07-01	11251
2014-10-01	14980
2015-01-01	11305
2015-04-01	13530
2015-07-01	12991
2015-10-01	12433
2016-01-01	18109
2016-04-01	18344
2016-07-01	19206
2016-10-01	18089
2017-01-01	20985
2017-04-01	22650
2017-07-01	15160
2017-10-01	15079
2018-01-01	10818
2018-04-01	11545