1979

5.7

2008

5.4

2002

6.5

2005

6.3

2000

6.8

2022

6.1

2005

6.2

1920

5.7

2006

5.6

2007

4.8

2013

5.0

2008

6.7

2000

6.7

2004

6.0

2006

4.9

1976

6.5

2007

4.4

1999

8.0

2017

6.2

1976

7.0