1963

5.9

1988

5.5

1985

6.6

1984

5.2

1983

6.6

1980

5.1

1980

4.5

1973

7.0

1979

3.0

1971

6.4

1981

6.0

1982

7.3

1957

7.6

1967

4.9

1970

6.4

1987

4.3