1973

6.9

1971

5.1

2023

8.4

2021

5.4

1989

9.2

2007

6.7

2018

4.5

2020

6.1

1975

6.9

2020

6.0

2013

7.8

2020

5.2

2008

6.1

1970

6.0

2006

7.2

1947

7.3

2011

6.9

1998

6.1

2019

6.5