1997

8.0

2015

5.1

2003

5.0

2023

6.8

1966

6.1

1968

6.4

2024

7.2

2019

8.7

2016

6.5

2008

6.9

6.6

1989

5.8

2020

6.4

1972

4.0

2021

6.1

1969

5.0

1982

8.1

2015

6.2