1974

6.5

2005

7.8

2005

6.3

2001

7.4

1995

6.6

2006

8.0

1998

6.4

1999

6.5

1997

7.5

1980

5.5

1953

7.8

1962

7.3

1931

8.1

1951

7.7

1998

6.9

1993

5.6

1980

1.0

2004

5.3

2023

0.0

2007

6.7