1995

7.9

1975

7.8

1996

7.9

2006

7.4

1984

6.0

1968

5.0

2000

6.3

1994

8.5

1996

7.0

1965

7.4

1968

6.4

1940

8.0

2004

6.6

1997

7.4

1973

7.1

1999

7.4

1967

7.5

1990

7.0

1993

6.2

1995

8.0