2000

6.0

1990

7.0

1995

8.0

1995

6.6

1996

8.0

1959

7.8

2000

7.3

1973

7.5

1991

8.3

1994

8.7

2003

6.5

1984

8.4

2003

7.7

1997

7.4

1971

8.2

1983

7.2

1986

7.8

1974

8.6

2005

6.7

2005

7.0