1995

5.2

1993

5.0

1977

5.3

1995

5.5

1987

5.7

1971

4.2

1949

4.5

1981

4.5

1951

5.0

1990

4.0

1983

4.0

1990

6.0

1988

5.0

1974

7.1

1967

5.6

1975

7.2

1991

4.3

1973

6.4

1979

5.0

1990

5.0

1967

5.0

1990

4.8

1976

4.9

1969

5.0

1972

6.0

1987

4.7