1997

7.9

1996

8.0

2002

6.9

2008

4.0

1949

6.9

1967

6.5

1998

5.8

1946

7.5

1991

6.8

1955

2.4

2007

5.5

1998

7.4

1995

6.4

2008

6.6

2001

6.4

2009

6.8

2005

6.2

2002

7.6

2022

0.0

2017

6.4