1972

6.6

2020

6.3

2015

6.4

6.5

1988

5.9

1985

6.8

1993

6.1

2019

7.7

2017

6.5

2020

7.3

2006

6.8

2024

5.8

6.7

2023

7.0

1975

6.9

2022

5.7

2009

7.6

1996

6.5

2021

6.3