1979

9.8

1991

6.2

1990

6.7

1993

5.5

2001

7.1

2002

6.9

2008

5.2

1967

7.7

2023

7.2

1985

6.8

1988

5.6

2002

7.1

2007

6.7

1982

4.9

1933

6.9

1933

7.3

1993

3.0

1980

5.0

1961

6.0

1935

7.3