2001

6.1

1931

5.8

2008

6.5

1989

7.8

1984

7.3

1994

8.3

2002

6.3

1998

6.4

2002

6.6

2005

7.4

1971

7.5

1967

6.7

2003

7.0

1940

7.1

1959

6.9

1979

6.5

2003

6.3

1996

6.1

1980

5.2

1978

6.2