1975

3.1

2014

6.6

1977

7.3

1947

6.5

2009

5.5

2008

5.2

2006

4.3

2007

4.8

2009

6.9

2007

7.0

2020

6.0

1981

6.0

2023

3.2

2024

0.0

2003

6.9

1981

6.2

1999

7.8

2009

3.9

1978

5.6

1982

5.5