1979

6.2

1984

5.6

1982

6.1

1980

5.7

1981

5.8

1984

6.2

1982

5.9

1976

6.5

1976

3.6

1977

2.5

1992

4.1

1979

4.8

1989

6.5

1951

0.0

1980

6.1

1976

4.0

1983

0.0

1976

6.1

1972

5.2

1979

5.2

1977

5.2

1975

4.8

1978

5.0

1978

5.4

1977

6.4

1975

4.9