1955

2.4

2004

5.8

2005

5.2

2007

6.8

1971

4.5

2010

6.8

2013

4.4

2000

5.3

1918

6.0

1904

5.5

2004

7.1

1976

7.3

1991

6.8

2009

6.2

1966

5.0

2010

7.2

1997

6.4

1949

5.8

2010

5.7

1995

6.2