1981

7.4

10.0

2010

7.0

1976

7.2

2016

6.6

1928

8.0

1952

7.6

1949

8.0

2007

6.6

2004

6.8

1977

8.0

1925

7.5

1959

7.1

1993

7.9

1976

6.6

1972

5.8

1965

7.5

1989

6.2

1945

7.5

1976

6.7