2011

8.5

2007

5.7

2010

6.5

2008

8.1

2020

6.1

2010

5.0

1957

8.0

2009

5.6

1994

6.0

2016

4.0

1974

5.3

1996

4.4

2006

5.0

2011

9.8

1984

5.0

1912

4.0

2005

8.3

2003

8.4

2008

5.2