Quarter	Millions of US Dollars
1973-07-01	25
1973-10-01	25
1974-01-01	25
1974-04-01	25
1974-07-01	25
1974-10-01	25
1975-01-01	25
1975-04-01	25
1975-07-01	25
1975-10-01	25
1976-01-01	25
1976-04-01	25
1976-07-01	25
1976-10-01	25
1977-01-01	25
1977-04-01	25
1977-07-01	25
1977-10-01	25
1978-01-01	25
1978-04-01	25
1978-07-01	25
1978-10-01	25
1979-01-01	25
1979-04-01	25
1979-07-01	25
1979-10-01	25
1980-01-01	25
1980-04-01	25
1980-07-01	25
1980-10-01	25
1981-01-01	25
1981-04-01	25
1981-07-01	25
1981-10-01	25
1982-01-01	25
1982-04-01	25
1982-07-01	25
1982-10-01	25
1983-01-01	25
1983-04-01	25
1983-07-01	25
1983-10-01	25
1984-01-01	25
1984-04-01	25
1984-07-01	25
1984-10-01	25
1985-01-01	25
1985-04-01	25
1985-07-01	25
1985-10-01	25
1986-01-01	25
1986-04-01	25
1986-07-01	25
1986-10-01	25
1987-01-01	25
1987-04-01	25
1987-07-01	25
1987-10-01	25
1988-01-01	25
1988-04-01	25
1993-07-01	150
1993-10-01	150
1994-01-01	150
1994-04-01	150
1994-07-01	195
1994-10-01	150
1995-01-01	150
1995-04-01	150
1995-07-01	150
1995-10-01	150
1996-01-01	150
1996-04-01	341
1996-07-01	341
1996-10-01	341
1997-01-01	341
1997-04-01	341
1997-07-01	341
1997-10-01	491
1998-01-01	491
1998-04-01	491
1998-07-01	341
1998-10-01	341
1999-01-01	341
1999-04-01	341
1999-07-01	341
1999-10-01	341
2000-01-01	341
2000-04-01	341
2000-07-01	341
2000-10-01	341
2001-01-01	341
2001-04-01	341
2001-07-01	341
2001-10-01	341
2002-01-01	341
2002-04-01	341
2002-07-01	341
2002-10-01	341
2003-01-01	341
2003-04-01	341
2003-07-01	384
2003-10-01	884
2004-01-01	693
2004-04-01	738
2004-07-01	738
2004-10-01	908
2005-01-01	896
2005-04-01	893
2005-07-01	860
2005-10-01	860
2006-01-01	860
2006-04-01	990
2006-07-01	990
2006-10-01	990
2007-01-01	990
2007-04-01	990
2007-07-01	990
2007-10-01	1550
2008-01-01	1550
2008-04-01	1550
2008-07-01	1550
2008-10-01	1550
2009-01-01	1550
2009-04-01	1550
2009-07-01	3550
2009-10-01	3550
2010-01-01	3550
2010-04-01	3550
2010-07-01	4100
2010-10-01	3500
2011-01-01	4557
2011-04-01	4616
2011-07-01	4537
2011-10-01	4523
2012-01-01	4613
2012-04-01	5400
2012-07-01	6155
2012-10-01	6174
2013-01-01	6424
2013-04-01	6359
2013-07-01	8865
2013-10-01	8995
2014-01-01	8970
2014-04-01	11527
2014-07-01	13106
2014-10-01	12675
2015-01-01	13071
2015-04-01	14566
2015-07-01	14335
2015-10-01	14325
2016-01-01	14213
2016-04-01	14589
2016-07-01	14871
2016-10-01	14812
2017-01-01	15080
2017-04-01	14204
2017-07-01	14250
2017-10-01	15000
2018-01-01	15161
2018-04-01	14680