1972

6.7

1966

5.7

1962

5.0

1970

7.1

1968

5.4

1956

5.8

1949

5.5

1959

7.3

1953

5.9

1969

5.3

1970

6.5

1963

4.1

1962

4.6

1969

7.2

1973

6.8

1959

4.3

1950

8.3

1973

4.6

1963

6.7

1968

5.3

1951

6.8