2001

5.7

1989

6.2

2001

5.2

1992

6.8

2000

6.3

1999

6.9

1996

6.2

1997

6.5

1947

6.5

2004

8.1

1987

7.3

1959

7.8

2003

7.8

1950

8.3

1978

7.4

1997

7.5

2004

7.2

1995

8.0

1939

7.5

1967

7.3