2009

6.1

2012

6.6

2012

6.0

2016

5.9

1983

5.5

1960

7.5

2013

6.5

2011

6.7

1975

7.8

2014

6.2

2013

7.8

2008

6.8

1962

7.8

1980

6.7

1992

6.9

1994

5.9

2012

6.4

1931

6.9

2006

6.9

1993

7.5