1975

5.2

1967

6.1

1970

6.1

1974

7.2

1985

6.6

1971

6.4

1988

7.3

1971

6.2

1984

6.3

1975

3.9

1976

5.3

1968

5.5

1982

4.9

1984

7.5

1977

6.6

1989

8.0

1988

0.0

1984

3.2

1975

6.0

1971

6.6

1968

6.7

1979

7.2

1980

6.0

1979

6.1

1969

5.4

1979

5.8

1973

6.7

1970

5.0

1974

5.1

1973

5.3

1982

5.2