1976

6.3

1975

6.9

1991

6.5

1992

6.2

1980

6.9

1977

6.8

1976

4.1

1978

7.0

1977

6.0

1981

6.1

1977

6.5

1983

4.1

1971

6.6

1973

6.3

1972

6.7

1978

6.1

1972

5.6

1982

4.0

1974

6.5

1982

6.3

1977

6.9

1980

7.1

1976

7.0

1990

5.8

1977

1.0

1984

7.3

1982

6.0

1973

5.6

1994

5.5

1984

6.7

1982

5.1

1981

7.0

1993

6.7

1984

5.8

1989

6.0

1979

6.5

1978

6.0

1983

6.6

1974

6.4

1982

6.7

1974

5.8

1978

6.4

1972

5.6

1973

5.5

1973

6.5

1977

5.9

1972

6.8

1980

5.5

1971

6.0

1972

6.2

1973

6.7

1981

6.7

1981

5.7

1979

6.4

1979

7.9

1974

5.9

1976

6.7

1973

3.5

1977

5.2

1976

5.3

1973

6.4

1979

6.2

1974

6.3

1977

6.5

1975

6.0

1978

6.5

1972

6.7

1976

6.4

1990

7.0

1980

5.2

1979

7.0