1997

6.7

1971

6.7

1964

7.8

1964

7.1

1954

8.0

1991

8.3

2003

6.5

1946

7.8

2006

5.5

1955

7.3

2002

6.7

1997

6.9

2002

5.4

2001

6.0

1997

6.0

1993

6.3

1996

5.6

1991

6.1

1993

6.3

2002

5.7