1979

5.7

1980

6.2

1974

7.2

1981

6.8

1977

6.5

1979

6.0

1980

6.3

1975

6.0

1976

6.5

1971

6.6

1963

7.5

1976

6.3

1973

6.7

1966

6.1

1987

5.3