2008

6.5

2007

6.5

2019

6.3

2020

6.1

1983

7.0

1968

6.4

2017

7.4

1990

6.2

1968

6.9

2008

8.0

1978

7.0

1966

6.5

2009

6.2

1995

7.8

2011

6.0

2014

6.7

2011

5.0

2010

7.7

2013

7.6