Quarterly Percent
1976-06-30 -100
1976-09-30 -100
1976-12-31 0
1977-03-31 0
1977-06-30 0
1977-09-30 0
1977-12-31 -100
1978-03-31 -100
1978-06-30 -100
1978-09-30 -100
1978-12-31 -100
1979-03-31 -100
1979-06-30 -100
1979-09-30 -100
1979-12-31 -100
1980-03-31 -100
1980-06-30 50
1980-09-30 66.7
1980-12-31 83.3
1981-03-31 37.5
1981-06-30 33.3
1981-09-30 50
1981-12-31 36.4
1982-03-31 20.9
1982-06-30 16
1982-09-30 0.5
1982-12-31 14.9
1983-03-31 28.5
1983-06-30 38.9
1983-09-30 41.5
1983-12-31 36.8
1984-03-31 36.7
1984-06-30 28
1984-09-30 15.9
1984-12-31 18
1985-03-31 16.9
1985-06-30 17.2
1985-09-30 25
1985-12-31 24.4
1986-03-31 25
1986-06-30 26.3
1986-09-30 27.2
1986-12-31 22.6
1987-03-31 20.3
1987-06-30 18.7
1987-09-30 14.4
1987-12-31 15.2
1988-03-31 15.1
1988-06-30 14
1988-09-30 15.2
1988-12-31 11.2
1989-03-31 8.2
1989-06-30 8.7
1989-09-30 8.6
1989-12-31 8
1990-03-31 14.6
1990-06-30 13.6
1990-09-30 17.2
1990-12-31 24.3
1991-03-31 15.8
1991-06-30 17.4
1991-09-30 14.4
1991-12-31 8.6
1992-03-31 11.1
1992-06-30 8
1992-09-30 3.8
1992-12-31 1.4
1993-03-31 1.6
1993-06-30 2.1
1993-09-30 3.9
1993-12-31 8.1
1994-03-31 7.1
1994-06-30 10.3
1994-09-30 12.3
1994-12-31 14.2
1995-03-31 17
1995-06-30 16.9
1995-09-30 14.8
1995-12-31 15.8
1996-03-31 16.1
1996-06-30 15
1996-09-30 18.6
1996-12-31 18.4
1997-03-31 19.2
1997-06-30 20
1997-09-30 18
1997-12-31 19.4
1998-03-31 19.4
1998-06-30 21
1998-09-30 22.7
1998-12-31 21.5
1999-03-31 23.3
1999-06-30 20.7
1999-09-30 19.7
1999-12-31 17.5
2000-03-31 16.9
2000-06-30 19.7
2000-09-30 18.7
2000-12-31 19.5
2001-03-31 17.5
2001-06-30 16.6
2001-09-30 17.3
2001-12-31 17.8
2002-03-31 21.3
2002-06-30 18.2
2002-09-30 19.7
2002-12-31 16.1
2003-03-31 14.8
2003-06-30 16.3
2003-09-30 15.3
2003-12-31 17.3
2004-03-31 18.5
2004-06-30 20.4
2004-09-30 22.6
2004-12-31 21.9
2005-03-31 22.6
2005-06-30 17.2
2005-09-30 10.9
2005-12-31 5.2
2006-03-31 2.3
2006-06-30 3.9
2006-09-30 5.2
2006-12-31 8
2007-03-31 8
2007-06-30 4.3
2007-09-30 4.7
2007-12-31 6.6
2008-03-31 8.6
2008-06-30 13.7
2008-09-30 16.3
2008-12-31 6.2
2009-03-31 4.2
2009-06-30 1
2009-09-30 -2.6
2009-12-31 4.7
2010-03-31 4.5
2010-06-30 3.6
2010-09-30 3.7
2010-12-31 2.8
2011-03-31 2.5
2011-06-30 3.3
2011-09-30 3.3
2011-12-31 2.5
2012-03-31 2.1
2012-06-30 1.6
2012-09-30 1.3
2012-12-31 2.4
2013-03-31 3.5
2013-06-30 5.1
2013-09-30 5.7
2013-12-31 5.9
2014-03-31 5.1
2014-06-30 4.1
2014-09-30 4
2014-12-31 4.5
2015-03-31 4.9