1972

7.1

1997

7.1

1990

7.8

1939

7.6

1953

8.0

1971

7.5

1973

6.5

2005

6.7

1962

7.0

1963

7.1

1964

7.4

1959

7.9

1967

6.6

1969

6.6

2001

7.9

2005

7.8

1974

6.5

1977

6.8

1979

6.2

1902

7.9