1981

8.3

2006

9.3

2001

6.6

1994

6.8

1993

6.6

2006

8.2

2017

7.1

1977

8.1

2023

6.5

2019

6.8

2001

7.5

1966

7.6

2018

8.5

1974

7.6

2013

8.6

1989

7.3

2021

7.4

2013

6.9

5.8

2015

8.3