1968

6.9

2017

6.0

2013

6.6

2012

5.6

2009

4.1

2011

5.8

1993

6.1

2022

7.8

1948

8.0

2000

7.2

1946

6.8

2001

5.1

2020

6.9

2011

6.8

2015

6.2

1969

7.9

1994

6.9