1993

6.3

1999

7.0

2006

6.3

2004

7.8

1916

6.6

1991

6.5

1934

6.2

1996

6.4

2000

4.8

2000

6.9

2005

6.5

1990

6.5

1973

6.9

1967

7.3

1996

6.5

1995

7.7

1976

7.2

2006

7.7

2002

6.7

2005

6.9