1986

8.3

1999

6.8

1998

7.0

2006

7.4

1989

8.0

1989

8.3

2011

8.1

2007

7.9

2011

7.4

2009

7.9

2009

7.6

2005

7.0

2024

5.3

2023

5.0

2021

6.3

2022

8.1

2021

8.2

2019

7.5

1990

4.5

1978

5.0