1988

6.3

1984

4.3

1993

4.0

1974

3.8

1978

6.8

1981

6.4

1985

6.0

1972

7.8

1981

5.5

1979

5.0

1991

3.7

1955

6.6

1977

0.0

1968

7.1

1992

7.3

1997

4.7

1972

7.7

1999

5.7

1976

0.0

1977

7.0

1971

4.3

1990

6.1

1991

5.9

1988

5.1

1969

6.0

1994

5.8

1985

3.7

1976

0.0

1974

0.0

1985

5.2

1981

5.8

1985

6.0

1998

6.0

1972

5.4

1975

4.0

1997

5.3

1983

6.0

1996

6.3