1993

6.9

1996

7.0

1988

5.5

1975

6.1

1969

5.0

1992

4.0

1974

6.0

1999

6.1

2000

6.2

1997

5.5

1976

6.6

1973

6.3

1987

0.0

1999

8.3

1974

0.0

1994

6.5

1973

5.0

2000

6.9

1974

6.3

1997

7.4

1968

5.4

1973

4.5

1985

6.1

1974

6.5

1974

5.0

1975

0.0

1977

6.3