1971

6.9

1973

6.9

1975

6.2

1962

7.6

1956

5.5

1961

5.3

1955

6.6

1967

6.8

1959

5.7

1954

6.1

1985

7.7

1967

6.7

1982

6.7

1960

6.2

1964

5.0

1965

3.5

1976

7.5

1959

7.2

1968

7.4

1962

5.7

1962

6.8

1965

6.1

1960

5.5

1962

5.0

1977

6.3

1968

5.2

1958

7.0

1972

6.3

1958

5.0

1959

8.4

1962

6.4

1973

6.1