1992

6.3

2002

6.7

1974

6.2

1997

6.4

1975

6.8

1949

7.1

2002

6.5

1981

6.7

1977

6.8

1972

6.1

1996

6.8

2004

5.9

1948

6.7

2003

6.7

1943

7.5

1944

6.9

1998

7.2

1947

7.0

1974

6.6

1954

6.8