Quarter	Percent
1977-03-31	9.4
1977-06-30	8.8
1977-09-30	8.1
1977-12-31	7.7
1978-03-31	6.9
1978-06-30	6.9
1978-09-30	8.4
1978-12-31	8.9
1979-03-31	10
1979-06-30	10
1979-09-30	10.6
1979-12-31	10.9
1980-03-31	13.1
1980-06-30	13.1
1980-09-30	13.1
1980-12-31	13.1
1981-03-31	11.6
1981-06-30	10.6
1981-09-30	10.6
1981-12-31	11.7
1982-03-31	12.2
1982-06-30	10.9
1982-09-30	10.5
1982-12-31	9.1
1983-03-31	7.8
1983-06-30	7.8
1983-09-30	9.1
1983-12-31	9.1
1984-03-31	9.7
1984-06-30	8.4
1984-09-30	9.8
1984-12-31	10.2
1985-03-31	10.3
1985-06-30	12.3
1985-09-30	11.9
1985-12-31	11.8
1986-03-31	12.5
1986-06-30	10.9
1986-09-30	10.7
1986-12-31	11.4
1987-03-31	12.1
1987-06-30	11
1987-09-30	10.5
1987-12-31	10
1988-03-31	9.1
1988-06-30	8.6
1988-09-30	9.4
1988-12-31	11.2
1989-03-31	11.6
1989-06-30	11.6
1989-09-30	11.6
1989-12-31	12.4
1990-03-31	13
1990-06-30	13.6
1990-09-30	13.7
1990-12-31	13.5
1991-03-31	13.1
1991-06-30	11.5
1991-09-30	10.2
1991-12-31	9.5
1992-03-31	9.2
1992-06-30	8.9
1992-09-30	8.4
1992-12-31	6.6
1993-03-31	5.3
1993-06-30	5
1993-09-30	4.9
1993-12-31	4.8
1994-03-31	4.4
1994-06-30	4.4
1994-09-30	4.4
1994-12-31	4.6
1995-03-31	4.8
1995-06-30	4.9
1995-09-30	4.8
1995-12-31	4.2
1996-03-31	3.7
1996-06-30	3.4
1996-09-30	3.2
1996-12-31	3
1997-03-31	3.2
1997-06-30	3.3
1997-09-30	3.9
1997-12-31	4.2
1998-03-31	3.9
1998-06-30	4
1998-09-30	4.1
1998-12-31	4.3
1999-03-31	3.4
1999-06-30	3
1999-09-30	2.9
1999-12-31	3
2000-03-31	3.2
2000-06-30	3.4
2000-09-30	3.4
2000-12-31	3.4
2001-03-31	3.3
2001-06-30	3
2001-09-30	2.7
2001-12-31	2.1
2002-03-31	1.8
2002-06-30	1.8
2002-09-30	1.8
2002-12-31	1.8
2003-03-31	1.7
2003-06-30	1.5
2003-09-30	1.4
2003-12-31	1.4
2004-03-31	1.6
2004-06-30	1.8
2004-09-30	2.2
2004-12-31	2.3
2005-03-31	2.3
2005-06-30	2.3
2005-09-30	2.2
2005-12-31	2.1
2006-03-31	2
2006-06-30	2
2006-09-30	2
2006-12-31	2.2
2007-03-31	2.6
2007-06-30	2.7
2007-09-30	3.1
2007-12-31	3.2