1969

7.1

1984

6.4

1983

5.7

1977

5.5

1987

6.2

1972

6.8

1981

6.0

1983

6.9

1971

5.8

1974

0.0

1974

5.8

1971

6.0

1970

6.7

1973

6.3

1987

6.7

1975

6.9

1972

6.7

1973

5.2

1972

5.6

1972

6.2

1973

6.5

1976

6.4

1972

6.9

1976

6.2

1971

6.9

1973

6.2

1976

6.7

1977

5.9

1971

6.6

1971

6.8

1983

6.3

1981

5.7

1974

6.0

1976

6.5

1982

6.0

1980

6.3

1980

6.2

1982

0.0

1974

6.4

1984

7.5

1980

2.0

1981

6.7

1976

6.1

1974

1.0

1976

4.7

1984

5.5

1982

4.0

1970

6.3