1977

6.7

2010

6.7

1994

6.5

1960

8.3

1949

7.7

2008

7.7

1995

5.9

1962

8.0

1895

6.8

2011

6.9

2006

7.0

1982

6.4

1987

7.1

1991

6.4

2012

5.5

1983

7.8

2002

7.3

2003

8.3

1998

6.8

2009

6.1