1987

12.37

−0.41

0.04

1988

12.53

−2.50

●

−0.56

●

1989

12.41

−2.54

●

−0.97

●

1990

11.98

−3.14

●

−1.43

●

1991

11.45

−2.88

●

−2.05

●

1992

10.58

−0.37

●

−1.32

●

1993

9.44

−0.04

●

−0.61

●

1994

9.29

0.09

−0.79

1995

8.85

0.05

●

0.15

●

1996

8.52

0.99

●

0.66

●

1997

9.00

−0.04

0.27

1998

9.17

−0.26

●

−0.63

●

1999

9.26

−1.42

●

−0.88

●

2000

8.55

−0.08

●

−0.99

●

2001

8.41

−0.59

●

−1.01

●

2002

7.58

−0.50

●

−0.30

●

2003

7.42

−0.43

●

−0.64

●

2004

7.29

−0.54

0.03

2005

6.79

0.94

●

0.60

●

2006

7.32

−0.02

●

−0.28

●

2007

7.38

0.01

●

0.23

●

2008

7.04

0.85

●

0.92

●

2009

7.61

−0.06

1.17

2010

7.94

1.37

●

1.41

●