1968

6.9

1953

6.6

1993

6.1

2009

4.1

1998

6.4

2017

6.8

1976

7.7

2021

6.1

1989

5.1

2003

7.5

1996

6.9

1981

8.1

1931

6.9

2015

6.3

1994

7.5

1980

8.4

1969

7.9

2013

8.1

2013

5.8

2020

6.7