1992

6.5

2019

6.7

2006

6.7

1985

6.0

1980

6.4

1976

7.5

2005

5.2

2008

5.8

1988

7.3

2006

5.5

2011

5.7

2023

6.7

2024

6.9

1995

5.6

1955

6.3

1993

6.6

2011

6.6

1995

7.8

2014

6.3

2015

6.4