Quarterly
1977-03-31 5.8
1977-06-30 3
1977-09-30 2.6
1977-12-31 2.1
1978-03-31 2.1
1978-06-30 2.9
1978-09-30 4.4
1978-12-31 5.1
1979-03-31 6.9
1979-06-30 6.7
1979-09-30 8.1
1979-12-31 8.9
1980-03-31 10.5
1980-06-30 10.5
1980-09-30 10
1980-12-31 9.2
1981-03-31 8.1
1981-06-30 6.3
1981-09-30 6.3
1981-12-31 8.9
1982-03-31 8.2
1982-06-30 7.2
1982-09-30 6.1
1982-12-31 4.7
1983-03-31 5.6
1983-06-30 4.9
1983-09-30 4.2
1983-12-31 4
1984-03-31 5.5
1984-06-30 5.6
1984-09-30 7.8
1984-12-31 7.1
1985-03-31 10.8
1985-06-30 10.9
1985-09-30 9.7
1985-12-31 9.1
1986-03-31 9.7
1986-06-30 7.8
1986-09-30 7.3
1986-12-31 8
1987-03-31 8
1987-06-30 6.4
1987-09-30 6.4
1987-12-31 6
1988-03-31 5.3
1988-06-30 4.7
1988-09-30 6.8
1988-12-31 8
1989-03-31 10.2
1989-06-30 10.6
1989-09-30 10.6
1989-12-31 11.1
1990-03-31 11.3
1990-06-30 11.5
1990-09-30 11.4
1990-12-31 10.4
1991-03-31 9.9
1991-06-30 8.3
1991-09-30 7.6
1991-12-31 7.2
1992-03-31 7
1992-06-30 6.3
1992-09-30 5.9
1992-12-31 3.7
1993-03-31 2.6
1993-06-30 2.2
1993-09-30 3
1993-12-31 3.2
1994-03-31 2.9
1994-06-30 2.9
1994-09-30 2.8
1994-12-31 3.1
1995-03-31 3.3
1995-06-30 3.5
1995-09-30 3.5
1995-12-31 3.2
1996-03-31 2.7
1996-06-30 2.4
1996-09-30 2.3
1996-12-31 2.2
1997-03-31 2.4
1997-06-30 2.5
1997-09-30 3.5
1997-12-31 3.8
1998-03-31 3.7
1998-06-30 3.7
1998-09-30 4
1998-12-31 3.8
1999-03-31 2.8
1999-06-30 2.4
1999-09-30 2.3
1999-12-31 2.4
2000-03-31 2.7
2000-06-30 2.9
2000-09-30 3
2000-12-31 3.1
2001-03-31 3
2001-06-30 2.7
2001-09-30 2.5
2001-12-31 2
2002-03-31 1.7
2002-06-30 1.8
2002-09-30 1.9
2002-12-31 1.8
2003-03-31 1.9
2003-06-30 1.8
2003-09-30 1.6
2003-12-31 1.7
2004-03-31 2.2
2004-06-30 2.4
2004-09-30 2.9
2004-12-31 3
2005-03-31 3.1
2005-06-30 3.1
2005-09-30 3
2005-12-31 2.8
2006-03-31 2.7
2006-06-30 2.7
2006-09-30 2.8
2006-12-31 2.9
2007-03-31 3.1
2007-06-30 3.2
2007-09-30 3.4
2007-12-31 3.5
2008-03-31 3.2
2008-06-30 3
2008-09-30 3.1
2008-12-31 2.4
2009-03-31 1
2009-06-30 0.7
2009-09-30 0.7
2009-12-31 0.7
2010-03-31 0.8
2010-06-30 0.8
2010-09-30 0.8
2010-12-31 0.8
2011-03-31 0.9
2011-06-30 0.9
2011-09-30 0.9
2011-12-31 1
2012-03-31 1
2012-06-30 1
2012-09-30 1
2012-12-31 1.1
2013-03-31 1.1
2013-06-30 1
2013-09-30 0.9