1964

6.2

1965

6.1

1966

6.1

1967

6.5

1952

6.2

1969

6.4

1965

6.2

1962

7.0

1955

7.2

1954

5.4

1942

0.0

1964

6.3

1965

6.9

2001

6.8

1950

6.8

1953

6.5

1968

6.2

1937

7.0

1966

6.3

1963

6.8