1973

6.3

1978

2.0

1982

6.3

1978

7.4

1971

6.6

1978

6.6

1972

6.7

1979

6.7

1981

5.7

1968

6.2

1972

6.6

1980

4.8

1969

7.1

1974

6.5

1975

5.5

1978

5.7

1983

6.3

1969

6.6

1979

6.5

1974

4.8

1972

6.1

1971

5.8

1972

6.7

1970

6.3

1980

5.9

1980

5.5

1972

6.2

1973

6.7

1975

6.7

1971

6.9

1981

6.7

1973

0.0

1969

5.9

1967

0.0

1969

6.6

1979

6.4

1975

0.0

1974

5.9

1986

7.6

1971

6.8

1967

6.7

1973

6.4

1972

6.1

1969

4.0

1967

6.8

1967

5.8

1970

6.3