5.8

1966

6.2

1989

5.9

2006

6.4

2019

7.7

10.0

1977

6.2

2020

6.8

2009

6.6

2021

7.8

2011

5.8

2008

5.1

1976

7.8

1994

7.0

2006

5.2

2001

4.2

2012

7.9

2001

7.2

1969

8.3