1984

6.1

2000

4.9

1983

4.6

1979

4.6

2014

6.2

1948

6.7

1988

4.5

1997

5.7

2006

6.8

1985

6.7

1980

5.7

1971

6.5

1940

6.3

1941

6.0

1947

5.5

1941

6.3

1937

5.6

1979

3.0

1938

5.8

1968

3.2