1979

6.3

1981

6.1

1983

7.0

2004

6.4

2024

9.0

2005

7.1

1993

6.9

1979

3.7

1953

7.3

2000

5.9

1998

6.0

2005

5.9

1997

6.1

2002

5.9

1969

6.2

1923

0.0

2004

6.4

2008

2.5

2006

7.4

1987

7.8