2006

6.0

2001

6.2

2005

6.0

1980

6.6

1982

6.4

2004

7.0

2006

7.2

2004

6.8

2008

4.9

1926

7.9

2005

5.2

2000

7.0

2001

6.3

1979

6.6

1999

6.1

2002

6.3

2003

7.8

1991

6.2

2001

6.8

2007

6.9