1992

6.3

1981

6.2

1982

6.3

1971

6.6

2006

7.3

1972

6.7

1979

6.5

1968

6.2

1980

4.8

1969

7.1

1988

5.9

1982

6.2

1984

7.3

1985

5.8

1982

5.1

1969

6.6

1981

7.1

1972

6.1

1971

5.8

1967

6.5

1977

5.9

1972

6.7

1970

6.3

1980

5.9

1972

6.2

1973

6.7

1971

6.9

1981

6.7

1969

5.9

1969

6.6

1972

5.8

1974

5.9

1976

5.3

1967

6.7

1975

6.0

1984

6.2

1968

5.9

1967

6.8

1967

5.8

1973

3.0

1966

0.0

1980

6.9

1980

5.2

1970

6.3

1974

5.0