1964

7.3

1961

6.5

1959

7.5

1982

7.3

1961

7.0

1965

7.8

1995

7.3

1990

6.2

1957

5.8

1985

3.0

1967

6.3

1953

6.0

1955

6.9

1972

7.0

1965

7.6

1977

5.8