1980

0.0

1967

6.1

1985

5.1

1989

7.2

1959

0.0

1980

0.0

1980

6.1

1979

8.5

1975

4.7

1988

0.0

1996

4.8

1970

6.7

1981

7.0

1978

5.2

1973

0.0

1987

5.2

1971

7.3

2007

7.8

1972

7.3

1982

7.2