1957

7.2

1955

5.6

1956

6.6

1947

6.5

1953

5.1

1957

5.4

1955

7.5

1951

6.7

1950

5.7

1960

7.7

1954

5.2

1958

5.3

1952

6.5

1960

5.7

1950

6.7

1959

6.1

1956

7.1

1962

7.8

1950

5.8

1956

6.6

1960

2.0

1955

6.3

1959

8.4

1955

6.4

1953

6.8

1961

6.4

1950

6.7

1957

6.4