2002

6.3

1953

6.0

1988

7.5

1977

7.7

1979

2.3

2006

7.0

2005

7.6

1993

7.0

1961

7.7

2007

5.4

1976

7.8

1979

7.3

1982

6.9

1985

7.1

1990

5.8

1988

6.7

2004

6.8

1969

8.0

1999

6.8

1996

6.0