1949

6.4

1964

0.0

1954

6.3

1967

8.0

1950

1.0

1953

4.3

1963

4.5

1968

6.3

1962

0.0

1951

4.0

1975

7.5

1952

2.5

1956

7.0

1957

6.1

1960

0.0

1981

6.2

1955

6.1

1962

5.8

1951

0.0

1971

6.5

1968

7.0