1993

6.1

2015

6.6

2008

7.5

2022

6.5

1985

6.1

1989

6.3

2017

9.4

2024

9.6

2011

6.4

2018

6.5

2006

6.9

2004

7.1

1968

6.9

1976

7.9

1965

6.8

1985

6.9

1968

6.9

2023

6.6

1987

8.0

2024

6.6