1968

6.9

1993

6.1

2003

5.8

2015

6.5

2011

5.7

2024

7.6

6.2

2020

6.4

2018

7.0

2023

6.4

1985

6.8

1972

6.6

1981

7.8

2020

6.3

1923

8.5

2021

7.6

2018

6.1

2020

5.8

2013

8.1

2014

6.9