1975

6.9

1981

6.0

1976

4.1

1992

6.3

1981

6.2

1983

4.1

1975

6.7

1982

6.4

1971

6.6

1973

0.0

2006

7.4

1978

6.6

1973

6.3

1972

6.7

1979

6.5

1972

5.6

1968

6.3

1980

4.8

1969

7.1

1988

5.9

1982

6.3

1984

7.3

1972

6.9

1985

5.4

1973

5.6

1982

5.1

1969

6.6

1981

7.0

1974

6.4

1982

6.7

1972

5.7

1971

5.8

1967

6.3

1973

5.5

1977

5.9

1974

0.0

1972

6.8

1970

6.3

1980

6.3

1971

6.0

1972

6.2

1973

6.7

1971

6.9

1981

6.7

1969

5.9

1970

6.7

1969

6.6

1972

5.8

1979

6.4

1974

5.9

1966

6.5

1980

6.2

1976

5.3

1967

6.8

1979

6.2

1974

6.3

1974

5.3

1975

6.0

1984

6.3

1968

5.9

1967

6.8

1967

5.8

1970

6.8

1973

3.0

1972

6.7

1966

0.0

1980

7.0

1980

5.2

1979

7.0

1970

6.2

1974

5.0