1996

6.4

1968

0.0

1956

5.3

1980

3.7

1994

5.2

1953

0.0

1998

6.0

1967

6.9

1984

7.6

1988

6.2

1976

7.5

1954

5.9

1952

4.8

1968

6.9

1981

4.1

1962

7.8

1971

0.0

1983

3.9

1987

8.6