1985

6.9

2006

6.7

2015

6.5

2023

6.4

2023

6.7

1988

5.5

2020

6.3

1991

5.7

1980

6.4

6.6

1989

4.9

1993

6.6

2011

6.9

2011

6.6

2019

6.7

2020

6.4

1985

7.2

1972

6.3

1985

6.1

2024

5.9