1968

6.9

2009

4.6

2015

6.4

1993

6.1

6.7

6.5

2020

6.3

2015

6.5

2024

7.6

2011

9.0

6.6

1984

6.0

2011

6.4

2022

6.3

1972

6.3

1985

6.9

2008

6.0

2006

6.8

2023

6.8