1968

6.9

2020

6.9

2009

5.6

2007

7.9

2017

5.9

1965

7.9

2020

6.7

1964

6.6

1938

6.5

1993

6.1

2016

6.7

1997

7.4

1994

7.6

2012

7.2

1981

7.0

2025

6.6

2010

5.0

2011

6.3

7.8

1923

8.5