1969

7.1

1967

6.8

1969

6.6

1974

5.3

1972

6.8

1973

3.5

1971

5.8

1977

6.8

1973

5.2

1974

5.8

1971

6.0

1970

6.7

1974

5.9

1980

4.0

1973

6.3

1974

6.5

1972

6.7

1974

0.0

1973

5.2

1972

5.6

1972

6.2

1974

6.3

1972

6.9

1970

6.8

1973

3.0

1970

6.2

1971

6.9

1973

6.4

1969

4.0

1972

6.7

1977

5.2

1975

6.2

1972

5.7

1971

6.6

1971

6.8

1967

5.8

1977

5.2

1976

4.1

1976

5.3

1975

6.7

1974

6.4

1976

6.5

1978

6.1

1978

6.4

1978

0.0

1967

6.8

1975

6.7

1972

5.4

1967

0.0

1966

6.5

1968

6.3

1978

5.3

1977

9.0

1974

6.7

1974

4.8

1974

5.0

1971

0.0

1969

5.9

1967

0.0

1967

0.0

1979

5.8

1970

6.3