1961

7.3

1999

6.8

1949

6.9

1966

6.8

1975

5.0

1951

6.3

1969

6.7

1940

6.4

1956

5.7

1967

6.2

1946

6.3

1964

5.3

1956

5.6

2013

6.2

1954

5.5

1956

6.0

1957

6.3

1973

5.5

1955

4.0

1955

5.2