1950

5.1

1953

5.7

1952

4.6

1953

6.0

1953

5.1

1954

6.1

1992

5.7

1954

6.2

1951

6.6

1958

5.1

1953

6.6

1952

6.2

1957

6.8

1950

7.0

1969

7.1

1961

6.7

1957

6.8

1950

6.1

1956

5.1

1952

6.0

1963

7.2

1955

6.4

1960

7.5

1956

3.5

1953

3.7

1952

6.9

1958

4.0

1953

5.1

1957

7.6