Quarter	Percent
1977-03-31	11.49
1977-06-30	7.69
1977-09-30	6.55
1977-12-31	5.4
1978-03-31	6.31
1978-06-30	8.63
1978-09-30	9.26
1978-12-31	11.23
1979-03-31	12.23
1979-06-30	11.76
1979-09-30	13.64
1979-12-31	15.3
1980-03-31	17.11
1980-06-30	16.59
1980-09-30	15.57
1980-12-31	14.96
1981-03-31	12.76
1981-06-30	11.91
1981-09-30	13.68
1981-12-31	15.04
1982-03-31	13.84
1982-06-30	12.82
1982-09-30	10.9
1982-12-31	9.38
1983-03-31	10.6
1983-06-30	9.61
1983-09-30	9.27
1983-12-31	8.83
1984-03-31	8.73
1984-06-30	8.71
1984-09-30	10.59
1984-12-31	9.59
1985-03-31	12.47
1985-06-30	12.08
1985-09-30	11.16
1985-12-31	11.09
1986-03-31	11.85
1986-06-30	9.61
1986-09-30	9.44
1986-12-31	10.65
1987-03-31	10.09
1987-06-30	8.64
1987-09-30	9.27
1987-12-31	8.7
1988-03-31	8.5
1988-06-30	7.91
1988-09-30	10.83
1988-12-31	11.99
1989-03-31	12.53
1989-06-30	12.93
1989-09-30	13.4
1989-12-31	14.55
1990-03-31	14.66
1990-06-30	14.59
1990-09-30	14.44
1990-12-31	13.29
1991-03-31	12.68
1991-06-30	11.05
1991-09-30	10.24
1991-12-31	10.03
1992-03-31	10.03
1992-06-30	9.7
1992-09-30	9.64
1992-12-31	7.03
1993-03-31	5.84
1993-06-30	5.42
1993-09-30	5.38
1993-12-31	5
1994-03-31	4.7
1994-06-30	4.6
1994-09-30	4.9
1994-12-31	5.6
1995-03-31	6.1
1995-06-30	6.2
1995-09-30	6.3
1995-12-31	6.1
1996-03-31	5.7
1996-06-30	5.4
1996-09-30	5.2
1996-12-31	5.7
1997-03-31	5.7
1997-06-30	6
1997-09-30	6.6
1997-12-31	6.9
1998-03-31	6.9
1998-06-30	7
1998-09-30	7.1
1998-12-31	6.3
1999-03-31	5
1999-06-30	4.7
1999-09-30	4.7
1999-12-31	5.4
2000-03-31	5.6
2000-06-30	5.7
2000-09-30	5.6
2000-12-31	5.5
2001-03-31	5.1
2001-06-30	4.7
2001-09-30	4.4
2001-12-31	3.6
2002-03-31	3.5
2002-06-30	3.6
2002-09-30	3.4
2002-12-31	3.4
2003-03-31	3.2
2003-06-30	3.1
2003-09-30	3
2003-12-31	3.3
2004-03-31	3.6
2004-06-30	4
2004-09-30	4.3
2004-12-31	4.3
2005-03-31	4.3
2005-06-30	4.3
2005-09-30	4
2005-12-31	4
2006-03-31	4
2006-06-30	4.1
2006-09-30	4.3
2006-12-31	4.7
2007-03-31	5
2007-06-30	5.2
2007-09-30	5.8
2007-12-31	5.8
2008-03-31	5.2
2008-06-30	5.3
2008-09-30	5.3
2008-12-31	4.1
2009-03-31	1.5
2009-06-30	0.8
2009-09-30	0.3
2009-12-31	0