1993

7.6

1992

6.5

1996

6.9

1997

6.0

1945

4.5

2000

6.9

2000

6.8

1994

5.6

1975

6.7

1954

6.9

2004

6.0

2008

6.2

2002

6.2

1977

6.9

1986

6.0

1929

5.7

1961

6.3

1977

6.8

1991

5.3

1981

6.1