- 1966[subject unknown]Independent
- 1967[subject unknown]Independent
- 1968[subject unknown]Independent
- 1969[subject unknown]Independent
- 1970[subject unknown]Independent
- 1971[subject unknown]Independent
- 1972[subject unknown]Independent
- 1973[subject unknown]Independent
- 1974[subject unknown]Independent
- 1975[subject unknown]Independent
- 1976[subject unknown]Independent Investigators
- 1977[subject unknown]Independent
- 1978[subject unknown]Independent
- 1981[subject unknown]Independent
- 1982[subject unknown]Independent
- 1983[subject unknown]Independent
- 1984[subject unknown]Independent
- 1985[subject unknown]Independent
- 1986[subject unknown]Independent
- 1987[subject unknown]Independent