1958

6.7

1971

6.9

1977

6.4

1972

0.0

1980

4.7

1953

0.0

1975

7.3

1971

6.6

1969

7.0

1960

5.0

1954

5.8

1960

7.6

1976

7.0

1957

6.0

1967

6.5

1961

3.9

1951

6.4