1975

6.7

1992

6.3

1974

6.2

1973

4.8

1949

7.1

1981

6.7

1957

7.6

1977

6.8

1968

0.0

1955

9.5

1996

6.8

2004

5.9

1948

6.7

2009

7.2

2003

6.7

1943

7.5

1993

7.3

1944

6.9

1998

7.2

1947

7.0