1997

7.9

2002

8.4

1961

7.5

2011

7.0

1949

6.9

1967

6.5

1991

6.8

2021

8.0

2023

0.0

2013

6.5

2008

6.0

2007

5.5

1985

6.2

1998

7.4

1995

6.4

2008

6.6

2001

6.4

2009

6.8

2005

6.2

2023

5.1