Quarter	Millions of US Dollars
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	0
1999-01-01	0
1999-04-01	0
1999-07-01	400
1999-10-01	400
2000-01-01	400
2000-04-01	900
2000-07-01	500
2000-10-01	500
2001-01-01	500
2001-04-01	108
2001-07-01	117
2001-10-01	113
2002-01-01	112
2002-04-01	531
2002-07-01	981
2002-10-01	981
2003-01-01	1781
2003-04-01	1278
2003-07-01	1052
2003-10-01	1955
2004-01-01	2320
2004-04-01	3587
2004-07-01	3621
2004-10-01	2800
2005-01-01	1524
2005-04-01	2239
2005-07-01	2750
2005-10-01	3104
2006-01-01	4113
2006-04-01	2131
2006-07-01	1480
2006-10-01	1969
2007-01-01	2238
2007-04-01	2338
2007-07-01	2988
2007-10-01	2119
2008-01-01	1250
2008-04-01	1105
2008-07-01	673
2008-10-01	2913
2009-01-01	3965
2009-04-01	3665
2009-07-01	3314
2009-10-01	1765
2010-01-01	700
2010-04-01	1700
2010-07-01	2450
2010-10-01	1750
2011-01-01	2350
2011-04-01	2072
2011-07-01	2074
2011-10-01	2046
2012-01-01	2342
2012-04-01	2575
2012-07-01	1775
2012-10-01	1775
2013-01-01	900
2013-04-01	2032
2013-07-01	2032
2013-10-01	2032
2014-01-01	2282
2014-04-01	750
2014-07-01	1250
2014-10-01	1250
2015-01-01	1750
2015-04-01	2250
2015-07-01	1750
2015-10-01	2250
2016-01-01	3000
2016-04-01	2000
2016-07-01	2300
2016-10-01	7128
2017-01-01	6328
2017-04-01	7228
2017-07-01	6928
2017-10-01	4217
2018-01-01	3547
2018-04-01	3738