1996

7.5

1988

5.2

2000

7.5

1986

6.7

1985

7.4

1985

8.3

1989

7.8

1990

7.5

1987

7.2

1986

6.4

1985

2.0

1985

6.9

1998

4.6

1987

6.5

1984

6.9