1955

5.6

1956

6.6

1972

8.6

1974

7.2

1973

5.9

1977

7.4

1964

5.1

1976

7.2

1961

7.3

1955

5.5

1961

6.7

1955

5.0

1981

6.6

2007

8.2

1952

6.9

1967

6.5