1975

6.9

1976

4.9

1973

6.3

1981

6.0

1978

2.0

1977

6.8

1976

3.8

1992

5.1

1978

7.0

1977

6.0

1980

4.8

1992

5.0

1977

6.5

1975

6.6

1979

6.2

1976

0.0

1983

5.7

1990

3.0

1972

6.7

1974

7.3

1979

6.5

1978

6.1

1972

5.3

1979

6.7

1981

5.7

1972

6.6

1969

7.1

1978

6.4

1978

5.6

1974

6.4

1985

6.3

1973

5.0

1982

5.2

1976

6.3

1979

0.0

1977

3.3

1979

7.0

1978

5.7

1972

6.9

1983

6.4

1986

6.7

1984

4.7

1978

5.7

1974

6.4

1982

6.8

1974

5.6

1977

6.0

1978

6.4

1978

6.1

1987

7.0

1972

5.7

1978

7.5

1977

5.7

1972

6.8

1976

4.0

1971

6.0

1972

6.2

1973

6.7

1971

6.9

1970

6.6

1991

4.7

1977

7.3

1974

5.8

1976

6.6

1973

3.0

1980

6.2

1977

5.1

1971

6.9

1976

5.3

1973

6.2

1978

6.8

1974

6.3

1977

6.5

1975

6.0

1979

7.9

1978

6.5

1978

6.8

1972

6.8

1976

6.4

1980

7.0

1975

6.2

1974

5.0