Quarter	Percent
1960-01-01	3.72
1960-04-01	4.00
1960-07-01	4.50
1960-10-01	4.50
1961-01-01	4.50
1961-04-01	5.00
1961-07-01	5.00
1961-10-01	4.50
1962-01-01	4.50
1962-04-01	3.15
1962-07-01	2.71
1962-10-01	2.35
1963-01-01	2.53
1963-04-01	2.67
1963-07-01	2.35
1963-10-01	2.46
1964-01-01	3.13
1964-04-01	3.50
1964-07-01	4.00
1964-10-01	4.50
1965-01-01	5.00
1965-04-01	5.00
1965-07-01	5.00
1965-10-01	5.00
1966-01-01	5.00
1966-04-01	5.00
1966-07-01	6.00
1966-10-01	6.00
1967-01-01	6.00
1967-04-01	6.00
1967-07-01	6.00
1967-10-01	6.00
1968-01-01	6.00
1968-04-01	6.00
1968-07-01	5.50
1968-10-01	5.50
1969-01-01	5.50
1969-04-01	5.50
1969-07-01	5.50
1969-10-01	5.50
1970-01-01	5.50
1970-04-01	5.50
1970-07-01	5.50
1970-10-01	5.50
1971-01-01	6.50
1971-04-01	6.50
1971-07-01	6.50
1971-10-01	6.50
1972-01-01	6.50
1972-04-01	6.50
1972-07-01	6.00
1972-10-01	6.00
1973-01-01	5.50
1973-04-01	5.50
1973-07-01	3.15
1973-10-01	3.78
1974-01-01	5.32
1974-04-01	6.22
1974-07-01	6.68
1974-10-01	6.48
1975-01-01	6.45
1975-04-01	6.05
1975-07-01	7.14
1975-10-01	7.42
1976-01-01	7.78
1976-04-01	7.84
1976-07-01	8.26
1976-10-01	8.28
1977-01-01	8.39
1977-04-01	8.36
1977-07-01	8.42
1977-10-01	8.41
1978-01-01	8.50
1978-04-01	8.50
1978-07-01	8.16
1978-10-01	7.87
1979-01-01	6.55
1979-04-01	5.84
1979-07-01	4.88
1979-10-01	4.70
1980-01-01	4.78
1980-04-01	5.08
1980-07-01	5.22
1980-10-01	6.54
1981-01-01	8.18
1981-04-01	10.50
1981-07-01	11.83
1981-10-01	14.54
1982-01-01	16.34
1982-04-01	16.76
1982-07-01	16.60
1982-10-01	14.35
1983-01-01	12.24
1983-04-01	13.99
1983-07-01	16.00
1983-10-01	17.75
1984-01-01	17.75
1984-04-01	17.75
1984-07-01	21.75
1984-10-01	20.75
1985-01-01	21.75
1985-04-01	18.75
1985-07-01	15.00
1985-10-01	13.00
1986-01-01	12.00
1986-04-01	11.00
1986-07-01	10.00
1986-10-01	9.50
1987-01-01	9.50
1987-04-01	9.50
1987-07-01	9.50
1987-10-01	9.50
1988-01-01	10.50
1988-04-01	11.50
1988-07-01	12.50
1988-10-01	14.50
1989-01-01	14.50
1989-04-01	17.00
1989-07-01	17.00
1989-10-01	18.00
1990-01-01	18.00
1990-04-01	18.00
1990-07-01	18.00
1990-10-01	18.00
1991-01-01	17.00
1991-04-01	17.00
1991-07-01	17.00
1991-10-01	17.00
1992-01-01	16.00
1992-04-01	15.00
1992-07-01	15.00
1992-10-01	14.00
1993-01-01	13.00
1993-04-01	13.00
1993-07-01	13.00
1993-10-01	12.00
1994-01-01	12.00
1994-04-01	12.00
1994-07-01	13.00
1994-10-01	13.00
1995-01-01	14.00
1995-04-01	15.00
1995-07-01	15.00
1995-10-01	15.00
1996-01-01	15.00
1996-04-01	16.00
1996-07-01	16.00
1996-10-01	17.00
1997-01-01	17.00
1997-04-01	17.00
1997-07-01	17.00
1997-10-01	16.00
1998-01-01	15.00
1998-04-01	20.21
1998-07-01	21.85
1998-10-01	19.32
1999-01-01	16.50
1999-04-01	14.91
1999-07-01	12.40
1999-10-01	12.00
2000-01-01	11.75
2000-04-01	11.75
2000-07-01	11.75
2000-10-01	12.00
2001-01-01	12.00
2001-04-01	11.00
2001-07-01	9.50
2001-10-01	9.50
2002-01-01	11.50
2002-04-01	12.50
2002-07-01	13.50
2002-10-01	13.50
2003-01-01	13.50
2003-04-01	12.00
2003-07-01	10.00
2003-10-01	8.00
2004-01-01	8.00
2004-04-01	8.00
2004-07-01	7.50
2004-10-01	7.50
2005-01-01	7.50
2005-04-01	7.00
2005-07-01	7.00
2005-10-01	7.00
2006-01-01	7.00
2006-04-01	7.50
2006-07-01	8.00
2006-10-01	9.00
2007-01-01	9.00
2007-04-01	9.50
2007-07-01	10.00
2007-10-01	11.00
2008-01-01	11.00
2008-04-01	12.00
2008-07-01	12.00
2008-10-01	11.50
2009-01-01	9.50
2009-04-01	7.50
2009-07-01	7.00
2009-10-01	7.00
2010-01-01	6.50
2010-04-01	6.50
2010-07-01	6.00
2010-10-01	5.50
2011-01-01	5.50
2011-04-01	5.50
2011-07-01	5.50
2011-10-01	5.50
2012-01-01	5.50
2012-04-01	5.50
2012-07-01	5.00
2012-10-01	5.00
2013-01-01	5.00
2013-04-01	5.00
2013-07-01	5.00
2013-10-01	5.00
2014-01-01	5.50
2014-04-01	5.50
2014-07-01	5.75
2014-10-01	5.75
2015-01-01	5.75
2015-04-01	5.75
2015-07-01	6.00
2015-10-01	6.25
2016-01-01	7.00
2016-04-01	7.00
2016-07-01	7.00
2016-10-01	7.00
2017-01-01	7.00
2017-04-01	7.00
2017-07-01	6.75
2017-10-01	6.75
2018-01-01	6.50
2018-04-01	6.50
2018-07-01	6.50