1975

7.0

2011

6.4

1972

6.6

6.6

2016

6.7

2018

6.5

1997

6.9

2023

6.8

2015

6.6

2024

7.2

2012

7.3

1998

8.6

1988

7.6

1993

7.5

2020

6.4

1980

5.9

2003

6.6

1953

4.8

2021

6.7