1973

8.0

2014

7.8

2012

6.8

2020

7.6

2021

7.9

2011

8.5

2015

7.3

2017

8.5

2005

8.1

2004

8.5

2013

7.0

1984

7.6

2017

5.9

1983

7.5

1996

7.3

2010

7.9

2019

7.5

2015

7.8

2015

7.6

2011

8.0