1967

6.5

2018

6.0

2001

6.7

2004

6.7

1993

6.2

1993

5.6

1982

7.6

2006

5.5

1971

5.3

2017

5.9

1953

7.1

2008

5.2

2014

7.1

2004

7.5

2013

8.1

2011

6.9

1993

7.4

1978

6.9

2010

7.3