1959

6.6

2013

6.0

1991

5.5

2006

5.3

2025

8.5

1958

6.3

1974

6.8

2008

6.0

2020

6.4

1981

2.0

2003

6.3

1999

8.0

1992

6.8

2003

6.7

2025

5.3

2008

5.9

2009

7.5

0.0

1968

1.0

2008

6.4