1932

7.5

1996

6.4

1956

7.9

1967

7.7

1965

7.6

1968

7.1

1973

6.9

1925

7.1

1957

8.3

1979

6.9

1959

7.9

1997

7.4

1995

7.7

1979

7.7

1961

7.3

1963

7.0

1964

7.0

1990

8.5

1939

7.9

1993

7.7