1959

6.0

1981

5.6

1953

5.9

1957

4.0

1982

7.5

1949

6.1

1979

6.8

1967

7.0

1989

5.1

1953

5.9

1952

6.0

1953

3.0

1982

1.0

1955

0.0

1971

6.2