7.8

1968

6.9

1967

7.7

2006

7.0

2014

5.6

2021

7.5

2003

6.1

1988

5.5

2011

7.1

2014

6.8

2023

6.5

2010

6.6

1972

6.2

1993

6.1

1988

5.9

2016

6.1

1952

7.9

1984

5.4

2013

7.6

2021

6.1