Quarterly
1977-03-31 6.5
1977-06-30 4
1977-09-30 3
1977-12-31 3.5
1978-03-31 3
1978-06-30 6.8
1978-09-30 6.8
1978-12-31 10
1979-03-31 10.5
1979-06-30 11.5
1979-09-30 11.5
1979-12-31 15
1980-03-31 15
1980-06-30 15
1980-09-30 14
1980-12-31 11.8
1981-03-31 9
1981-06-30 9
1981-09-30 11.3
1981-12-31 12.4
1982-03-31 10.1
1982-06-30 9.5
1982-09-30 7.3
1982-12-31 6.8
1983-03-31 7.5
1983-06-30 6
1983-09-30 6
1983-12-31 5.5
1984-03-31 8.3
1984-06-30 8.3
1984-09-30 9.7
1984-12-31 9
1985-03-31 11.5
1985-06-30 12.2
1985-09-30 11.4
1985-12-31 11.1
1986-03-31 12.1
1986-06-30 9.5
1986-09-30 9.2
1986-12-31 10.6
1987-03-31 9.6
1987-06-30 8.8
1987-09-30 9.4
1987-12-31 8.9
1988-03-31 8.5
1988-06-30 7.8
1988-09-30 10.2
1988-12-31 11.7
1989-03-31 12
1989-06-30 12
1989-09-30 12.2
1989-12-31 12.6
1990-03-31 13.6
1990-06-30 13.8
1990-09-30 13.8
1990-12-31 13
1991-03-31 12.3
1991-06-30 10.8
1991-09-30 9.7
1991-12-31 9.8
1992-03-31 8.5
1992-06-30 9
1992-09-30 8.6
1992-12-31 6.5
1993-03-31 5.4
1993-06-30 5.2
1993-09-30 5.1
1993-12-31 4.7
1994-03-31 4.4
1994-06-30 4.4
1994-09-30 4.4
1994-12-31 4.6
1995-03-31 4.9
1995-06-30 5.2
1995-09-30 5.3
1995-12-31 5.1
1996-03-31 4.7
1996-06-30 4.4
1996-09-30 4.3
1996-12-31 4.2
1997-03-31 4.4
1997-06-30 4.6
1997-09-30 5.5
1997-12-31 5.9
1998-03-31 6
1998-06-30 6
1998-09-30 6.2
1998-12-31 5
1999-03-31 4.9
1999-06-30 4.8
1999-09-30 4.8
1999-12-31 5
2000-03-31 5.4
2000-06-30 5.4
2000-09-30 5.4
2000-12-31 5.5
2001-03-31 5.1
2001-06-30 5.2
2001-09-30 4.9
2001-12-31 4.4
2002-03-31 3.9
2002-06-30 4
2002-09-30 3.8
2002-12-31 3.6
2003-03-31 3.5
2003-06-30 3.5
2003-09-30 3.5
2003-12-31 3.5
2004-03-31 3.3
2004-06-30 3.4
2004-09-30 3.9
2004-12-31 4.2
2005-03-31 4.2
2005-06-30 4.2
2005-09-30 4.1
2005-12-31 3.9
2006-03-31 3.9
2006-06-30 4
2006-09-30 4
2006-12-31 4.2
2007-03-31 4.6
2007-06-30 4.8
2007-09-30 5
2007-12-31 5.2
2008-03-31 5.1
2008-06-30 5.2
2008-09-30 5.4
2008-12-31 5.4
2009-03-31 4.7
2009-06-30 4.4
2009-09-30 4
2009-12-31 3.9
2010-03-31 3.9
2010-06-30 4
2010-09-30 4
2010-12-31 4
2011-03-31 2.8
2011-06-30 2.9
2011-09-30 2.9
2011-12-31 3
2012-03-31 3.1
2012-06-30 3
2012-09-30 3
2012-12-31 3
2013-03-31 3
2013-06-30 2.9
2013-09-30 2.8