2004

6.2

2008

5.8

2006

5.8

1990

6.4

1968

3.9

2010

6.5

1962

6.4

2009

5.2

2005

6.5

2020

3.3

1987

6.2

2021

4.6

1996

6.3

2025

0.0

2015

7.3

1981

4.3

1987

1.3

1977

0.0

1931

4.2

2014

6.4