Quarter	Millions of US Dollars
1973-04-01	43
1973-07-01	43
1973-10-01	43
1974-01-01	43
1974-04-01	43
1974-07-01	43
1974-10-01	43
1975-01-01	43
1975-04-01	43
1975-07-01	43
1975-10-01	43
1976-01-01	43
1976-04-01	43
1976-07-01	43
1976-10-01	43
1977-01-01	43
1977-04-01	43
1977-07-01	43
1977-10-01	43
1978-01-01	43
1978-04-01	68
1978-07-01	68
1978-10-01	68
1979-01-01	68
1979-04-01	68
1979-07-01	68
1979-10-01	68
1980-01-01	68
1980-04-01	98
1980-07-01	98
1980-10-01	98
1981-01-01	98
1981-04-01	98
1981-07-01	98
1981-10-01	98
1982-01-01	98
1982-04-01	138
1982-07-01	138
1982-10-01	138
1983-01-01	138
1983-04-01	113
1983-07-01	113
1983-10-01	113
1984-01-01	113
1984-04-01	113
1984-07-01	113
1984-10-01	70
1985-01-01	70
1985-04-01	40
1985-07-01	40
1985-10-01	32
1986-01-01	32
1986-04-01	32
1986-07-01	32
1986-10-01	32
1987-01-01	32
2001-07-01	1500
2001-10-01	1500
2002-01-01	1500
2002-04-01	1500
2002-07-01	1500
2002-10-01	1500
2003-01-01	1500
2003-04-01	1500
2003-07-01	1500
2003-10-01	1500
2004-01-01	1500
2004-04-01	1500
2004-07-01	1500
2004-10-01	1500
2005-01-01	1500
2005-04-01	1500
2005-07-01	2750
2005-10-01	2750
2006-01-01	2750
2006-04-01	2750
2006-07-01	2250
2006-10-01	2250
2007-01-01	3000
2007-04-01	3000
2007-07-01	4076
2007-10-01	4090
2008-01-01	4102
2008-04-01	4195
2008-07-01	4166
2008-10-01	4156
2009-01-01	4130
2009-04-01	4139
2009-07-01	4159
2009-10-01	4462
2010-01-01	4458
2010-04-01	5920
2010-07-01	5919
2010-10-01	5898
2011-01-01	5868
2011-04-01	5118
2011-07-01	4118
2011-10-01	4107
2012-01-01	4105
2012-04-01	4102
2012-07-01	3109
2012-10-01	3050
2013-01-01	3050
2013-04-01	5750
2013-07-01	6750
2013-10-01	6750
2014-01-01	6750
2014-04-01	6750
2014-07-01	6750
2014-10-01	3750
2015-01-01	3750
2015-04-01	5387
2015-07-01	4137
2015-10-01	5181
2016-01-01	5181
2016-04-01	5181
2016-07-01	4181
2016-10-01	8339
2017-01-01	10418
2017-04-01	12046
2017-07-01	12046
2017-10-01	10728
2018-01-01	13531
2018-04-01	18257