1975

6.9

1980

6.6

1977

6.8

1977

7.0

1978

4.3

1976

4.1

1962

0.0

1978

7.0

1977

6.0

1980

4.8

1977

6.5

1983

4.1

1971

6.5

1976

0.0

1973

6.3

1979

6.5

1978

6.1

1972

5.6

1973

5.2

1982

4.0

1982

6.2

1976

6.5

1990

5.8

1977

4.5

1993

6.3

1978

5.7

1990

6.1

1972

7.0

1982

6.0

1985

4.7

1973

5.6

1984

6.9

1990

6.6

1981

7.0

1979

6.5

1983

6.6

1974

6.4

1982

6.7

1974

5.8

1977

6.0

1978

6.4

1978

6.1

1972

5.7

1978

7.5

1972

5.6

1972

6.8

1980

5.5

1971

6.0

1973

6.7

1981

6.7

1983

5.0

1974

5.0

1979

6.4

1971

6.6

1976

6.7

1971

6.8

1973

6.2

1979

6.1

1980

5.5

1972

5.7

1978

6.8

1972

6.8

1976

6.4

1980

7.0

1980

5.2

1977

0.0

1979

7.0

1981

5.0