1951

6.3

1966

7.3

1949

5.8

1955

6.6

1952

6.2

1964

6.1

1959

6.4

1985

6.5

1956

6.0

1959

7.1

1950

5.7

1979

5.0

1950

6.2

1965

7.1

1957

5.2

1955

6.4