1911

5.5

1991

6.0

2008

6.1

2009

7.2

1999

6.5

1933

6.2

1997

6.7

2001

7.3

2017

4.0

1940

7.0

1980

8.1

1998

6.9

2018

6.9

1989

7.5

1992

7.4

2003

6.1

2017

8.0

1975

7.5

1956

6.7

1995

6.5