1964

4.0

1968

4.8

1949

6.3

1951

5.8

1955

6.9

1971

5.5

1952

6.2

1955

8.2

1951

5.5

1958

5.0

1955

5.0

1956

5.0

1965

5.1

1950

5.5

1964

5.0