1997

0.0

1977

6.7

1972

0.0

1980

7.5

1983

0.0

2009

6.8

1968

6.8

1988

3.5

1987

4.3

1982

0.0

1978

4.8

1976

6.3

1973

5.0

1987

5.2

1981

0.0

1979

7.0