1980

0.0

1967

6.0

1985

5.1

1989

7.2

1965

5.0

1959

0.0

1980

0.0

1980

6.1

1979

8.5

1975

4.7

1988

0.0

1996

4.8

1970

6.8

1991

6.0

1974

7.0

1981

7.0

1982

0.0

1973

0.0

1987

5.2

1971

7.4

2007

7.8

1972

7.1