2017

8.0

2015

7.4

2006

6.6

1977

6.6

1952

6.7

2010

7.0

1961

7.9

2014

5.6

7.8

2001

4.9

2010

7.3

1988

6.0

1963

7.0

2009

6.5

1966

6.6

2011

5.9

1992

6.4

1921

6.8

1987

7.4

2012

5.7