1937

5.5

1997

6.5

1999

5.6

1998

6.5

1999

6.8

2004

7.5

2000

6.8

1997

6.7

1983

6.0

1942

4.7

1988

6.9

1993

6.2

1972

7.3

1970

6.5

1986

6.7

1926

7.9

1979

7.5

2017

6.0

2017

5.9

2023

7.0