2000

6.5

2001

6.7

1994

6.8

2001

7.2

1983

7.8

1975

8.0

2002

7.3

2004

8.1

2000

7.6

1987

7.8

2000

5.2

2002

7.0

2001

6.8

1961

7.2

2003

4.7

1953

8.2

2007

5.5

1995

7.0

1993

5.1

2002

5.2