1980

5.5

1955

6.5

2017

4.2

1990

5.7

2003

5.8

1985

7.0

1957

6.8

1974

6.2

1964

6.1

1973

3.1

1991

6.0

1966

4.3

1997

6.1

1931

7.5

1994

6.4

1993

6.5

1932

6.0

1940

6.1

1990

7.4

2021

5.7