1974

6.3

1970

6.1

1976

5.8

1973

7.0

1983

5.5

1974

6.2

1964

5.0

1962

0.0

1975

7.3

1961

5.9

1985

7.1

1960

0.0

1954

3.7

1973

7.2

1971

7.0