2005

7.0

2006

7.0

2003

7.1

1997

6.5

1976

7.1

1998

7.7

2006

6.7

1914

6.5

1990

6.1

1999

6.9

1994

7.6

2007

6.2

1997

5.6

2001

6.0

1980

6.0

2006

6.1

1998

6.2

2004

6.5

1963

6.5

1991

7.3