1962

7.3

1968

7.8

1999

5.7

1957

7.8

2004

7.2

1988

7.2

1993

5.5

1968

7.6

1960

6.5

1997

7.4

1986

7.5

1953

8.0

1955

7.6

1983

7.2

1930

7.3

1986

7.9

1972

8.7

1974

8.6

2002

6.7

2005

6.7