2015

5.1

2018

5.0

1968

6.9

2014

7.6

2007

7.9

2006

7.2

1943

6.4

2001

6.9

1982

5.8

1996

6.4

2006

5.0

2020

7.4

2007

6.9

2009

6.5

1987

7.5

1997

4.4

1938

7.0

1978

7.4

2017

6.0