2005

3.8

2010

6.9

2011

8.0

1928

6.0

2009

8.5

1990

6.9

1939

5.0

1974

6.5

1982

6.1

2020

7.4

2014

6.5

2013

5.8

2008

6.2

1999

6.7

2008

6.4

1996

7.3

1983

6.8

1942

7.0

1922

6.2

1989

6.2