Quarter	Percent
1960-01-01	3.66
1960-04-01	3.32
1960-07-01	1.93
1960-10-01	3.71
1961-01-01	3.46
1961-04-01	2.80
1961-07-01	2.67
1961-10-01	3.18
1962-01-01	3.35
1962-04-01	6.00
1962-07-01	5.50
1962-10-01	4.00
1963-01-01	4.00
1963-04-01	3.50
1963-07-01	4.00
1963-10-01	4.00
1964-01-01	4.00
1964-04-01	4.00
1964-07-01	4.00
1964-10-01	4.25
1965-01-01	4.25
1965-04-01	4.25
1965-07-01	4.25
1965-10-01	4.75
1966-01-01	5.25
1966-04-01	5.25
1966-07-01	5.25
1966-10-01	5.25
1967-01-01	5.00
1967-04-01	4.50
1967-07-01	5.00
1967-10-01	6.00
1968-01-01	7.50
1968-04-01	7.50
1968-07-01	6.00
1968-10-01	6.50
1969-01-01	7.00
1969-04-01	7.50
1969-07-01	8.00
1969-10-01	8.00
1970-01-01	8.00
1970-04-01	7.00
1970-07-01	6.50
1970-10-01	6.00
1971-01-01	5.25
1971-04-01	5.25
1971-07-01	5.25
1971-10-01	4.75
1972-01-01	4.75
1972-04-01	4.75
1972-07-01	4.75
1972-10-01	4.75
1973-01-01	4.75
1973-04-01	6.25
1973-07-01	7.25
1973-10-01	7.25
1974-01-01	7.25
1974-04-01	8.75
1974-07-01	9.25
1974-10-01	8.75
1975-01-01	8.25
1975-04-01	8.25
1975-07-01	9.00
1975-10-01	9.00
1976-01-01	9.50
1976-04-01	9.50
1976-07-01	9.50
1976-10-01	8.50
1977-01-01	8.00
1977-04-01	7.50
1977-07-01	7.50
1977-10-01	7.50
1978-01-01	8.00
1978-04-01	8.50
1978-07-01	9.50
1978-10-01	10.75
1979-01-01	11.25
1979-04-01	11.25
1979-07-01	12.25
1979-10-01	14.00
1980-01-01	14.79
1980-04-01	10.67
1980-07-01	11.02
1980-10-01	17.26
1981-01-01	16.59
1981-04-01	19.07
1981-07-01	19.63
1981-10-01	14.66
1982-01-01	15.11
1982-04-01	16.58
1982-07-01	13.18
1982-10-01	10.26
1983-01-01	9.42
1983-04-01	9.42
1983-07-01	9.52
1983-10-01	10.04
1984-01-01	10.76
1984-04-01	11.98
1984-07-01	12.28
1984-10-01	10.16
1985-01-01	11.18
1985-04-01	9.57
1985-07-01	9.31
1985-10-01	9.49
1986-01-01	10.44
1986-04-01	8.84
1986-07-01	8.63
1986-10-01	8.49
1987-01-01	7.14
1987-04-01	8.59
1987-07-01	9.57
1987-10-01	8.66
1988-01-01	8.78
1988-04-01	9.44
1988-07-01	10.54
1988-10-01	11.17
1989-01-01	12.40
1989-04-01	12.31
1989-07-01	12.47
1989-10-01	12.47
1990-01-01	13.38
1990-04-01	13.90
1990-07-01	12.61
1990-10-01	11.78
1991-01-01	9.92
1991-04-01	8.91
1991-07-01	8.68
1991-10-01	7.67
1992-01-01	7.65
1992-04-01	5.91
1992-07-01	5.69
1992-10-01	7.36
1993-01-01	5.36
1993-04-01	4.79
1993-07-01	4.90
1993-10-01	4.11
1994-01-01	5.64
1994-04-01	6.92
1994-07-01	5.54
1994-10-01	7.43
1995-01-01	8.47
1995-04-01	6.97
1995-07-01	6.71
1995-10-01	5.79
1996-01-01	5.25
1996-04-01	5.00
1996-07-01	4.25
1996-10-01	3.25
1997-01-01	3.25
1997-04-01	3.25
1997-07-01	3.50
1997-10-01	4.50
1998-01-01	5.00
1998-04-01	5.00
1998-07-01	5.75
1998-10-01	5.25
1999-01-01	5.00
1999-04-01	4.75
1999-07-01	4.75
1999-10-01	5.00
2000-01-01	5.50
2000-04-01	6.00
2000-07-01	6.00
2000-10-01	6.00
2001-01-01	5.25
2001-04-01	4.75
2001-07-01	3.75
2001-10-01	2.50
2002-01-01	2.25
2002-04-01	2.75
2002-07-01	3.00
2002-10-01	3.00
2003-01-01	3.25
2003-04-01	3.50
2003-07-01	3.00
2003-10-01	3.00
2004-01-01	2.50
2004-04-01	2.25
2004-07-01	2.50
2004-10-01	2.75
2005-01-01	2.75
2005-04-01	2.75
2005-07-01	3.00
2005-10-01	3.50
2006-01-01	4.00
2006-04-01	4.50
2006-07-01	4.50
2006-10-01	4.50
2007-01-01	4.50
2007-04-01	4.50
2007-07-01	4.75
2007-10-01	4.50
2008-01-01	3.75
2008-04-01	3.25
2008-07-01	3.25
2008-10-01	1.75
2009-01-01	0.75
2009-04-01	0.50
2009-07-01	0.50
2009-10-01	0.50
2010-01-01	0.50
2010-04-01	0.75
2010-07-01	1.25
2010-10-01	1.25
2011-01-01	1.25
2011-04-01	1.25
2011-07-01	1.25
2011-10-01	1.25
2012-01-01	1.25
2012-04-01	1.25
2012-07-01	1.25
2012-10-01	1.25
2013-01-01	1.25
2013-04-01	1.25
2013-07-01	1.25
2013-10-01	1.25
2014-01-01	1.25
2014-04-01	1.25
2014-07-01	1.25
2014-10-01	1.25
2015-01-01	1.00
2015-04-01	1.00
2015-07-01	0.75
2015-10-01	0.75
2016-01-01	0.75
2016-04-01	0.75
2016-07-01	0.75
2016-10-01	0.75
2017-01-01	0.75
2017-04-01	0.75
2017-07-01	1.25
2017-10-01	1.25
2018-01-01	1.50
2018-04-01	1.50
2018-07-01	1.75