1910

6.0

1931

7.5

1994

6.4

1993

6.6

2004

5.0

1981

6.4

1984

5.8

1973

6.7

2005

5.6

1987

4.0

1990

5.7

1942

5.8

1969

6.4

1943

6.2

1939

6.7

1957

6.8

2004

6.4

1967

6.5

1974

7.5

1966

6.3