1955

7.8

1958

5.8

1980

5.5

1967

5.9

1962

5.4

1981

7.6

1976

6.0

1964

5.0

1979

4.8

1969

5.6

1945

6.1

1958

6.2

1957

5.5

1974

7.3

1953

5.7