1970

6.0

1999

7.4

2023

6.3

2010

6.1

2017

5.9

2024

7.1

2011

5.6

2007

5.7

2005

5.7

2007

6.7

1974

6.6

2010

7.0

2008

6.5

2022

7.5

1986

5.8

1998

7.7

2004

8.1

1947

7.6

1955

6.7

2014

5.6