Quarter	Percent
1965-01-01	6.40
1965-04-01	6.49
1965-07-01	6.53
1965-10-01	6.62
1966-01-01	6.69
1966-04-01	6.82
1966-07-01	7.03
1966-10-01	7.10
1967-01-01	7.13
1967-04-01	7.11
1967-07-01	7.20
1967-10-01	7.42
1968-01-01	7.84
1968-04-01	7.85
1968-07-01	7.76
1968-10-01	7.53
1969-01-01	7.46
1969-04-01	7.45
1969-07-01	7.60
1969-10-01	7.57
1970-01-01	7.71
1970-04-01	7.88
1970-07-01	7.83
1970-10-01	7.84
1971-01-01	7.75
1971-04-01	7.77
1971-07-01	7.66
1971-10-01	7.65
1972-01-01	7.64
1972-04-01	7.38
1972-07-01	7.14
1972-10-01	7.37
1973-01-01	7.91
1973-04-01	7.96
1973-07-01	8.33
1973-10-01	8.80
1974-01-01	8.97
1974-04-01	9.81
1974-07-01	10.16
1974-10-01	10.02
1975-01-01	9.88
1975-04-01	9.63
1975-07-01	9.54
1975-10-01	9.38
1976-01-01	9.17
1976-04-01	8.74
1976-07-01	8.55
1976-10-01	8.55
1977-01-01	8.52
1977-04-01	8.59
1977-07-01	8.80
1977-10-01	9.02
1978-01-01	8.79
1978-04-01	8.23
1978-07-01	7.87
1978-10-01	7.96
1979-01-01	7.58
1979-04-01	7.84
1979-07-01	8.19
1979-10-01	8.24
1980-01-01	8.51
1980-04-01	9.15
1980-07-01	9.37
1980-10-01	9.76
1981-01-01	9.92
1981-04-01	10.44
1981-07-01	11.17
1981-10-01	10.89
1982-01-01	10.66
1982-04-01	10.11
1982-07-01	9.91
1982-10-01	9.01
1983-01-01	8.25
1983-04-01	8.10
1983-07-01	8.27
1983-10-01	8.08
1984-01-01	7.91
1984-04-01	8.00
1984-07-01	8.09
1984-10-01	8.07
1985-01-01	8.02
1985-04-01	7.99
1985-07-01	7.56
1985-10-01	7.51
1986-01-01	7.64
1986-04-01	7.24
1986-07-01	7.13
1986-10-01	7.31
1987-01-01	7.08
1987-04-01	6.74
1987-07-01	6.84
1987-10-01	7.09
1988-01-01	6.78
1988-04-01	6.62
1988-07-01	6.70
1988-10-01	6.58
1989-01-01	6.75
1989-04-01	7.09
1989-07-01	7.15
1989-10-01	7.57
1990-01-01	8.43
1990-04-01	8.80
1990-07-01	8.83
1990-10-01	8.91
1991-01-01	8.67
1991-04-01	8.49
1991-07-01	8.67
1991-10-01	8.63
1992-01-01	8.35
1992-04-01	8.49
1992-07-01	8.57
1992-10-01	7.67
1993-01-01	7.07
1993-04-01	6.88
1993-07-01	6.52
1993-10-01	6.09
1994-01-01	5.91
1994-04-01	6.63
1994-07-01	6.93
1994-10-01	7.30
1995-01-01	7.20
1995-04-01	6.58
1995-07-01	6.26
1995-10-01	5.84
1996-01-01	5.42
1996-04-01	5.45
1996-07-01	5.42
1996-10-01	4.90
1997-01-01	4.65
1997-04-01	4.71
1997-07-01	4.77
1997-10-01	5.01
1998-01-01	4.58
1998-04-01	4.59
1998-07-01	4.21
1998-10-01	3.79
1999-01-01	3.53
1999-04-01	3.59
1999-07-01	4.43
1999-10-01	4.83
2000-01-01	5.19
2000-04-01	5.31
2000-07-01	5.48
2000-10-01	5.26
2001-01-01	4.79
2001-04-01	4.87
2001-07-01	4.64
2001-10-01	4.19
2002-01-01	4.63
2002-04-01	4.80
2002-07-01	4.29
2002-10-01	3.88
2003-01-01	3.39
2003-04-01	3.17
2003-07-01	3.41
2003-10-01	3.66
2004-01-01	3.38
2004-04-01	3.53
2004-07-01	3.49
2004-10-01	3.23
2005-01-01	3.13
2005-04-01	2.89
2005-07-01	2.80
2005-10-01	3.07
2006-01-01	3.29
2006-04-01	3.75
2006-07-01	3.77
2006-10-01	3.74
2007-01-01	4.00
2007-04-01	4.35
2007-07-01	4.39
2007-10-01	4.21
2008-01-01	3.88
2008-04-01	4.38
2008-07-01	4.45
2008-10-01	3.69
2009-01-01	3.54
2009-04-01	3.48
2009-07-01	3.16
2009-10-01	2.94
2010-01-01	2.90
2010-04-01	2.49
2010-07-01	2.17
2010-10-01	2.34
2011-01-01	2.80
2011-04-01	2.95
2011-07-01	2.37
2011-10-01	2.42
2012-01-01	2.14
2012-04-01	1.68
2012-07-01	1.10
2012-10-01	1.02
2013-01-01	0.98
2013-04-01	0.84
2013-07-01	1.13
2013-10-01	1.25
2014-01-01	1.22
2014-04-01	1.08
2014-07-01	0.86
2014-10-01	0.66
2015-01-01	0.46