Table:
text: Steve Williams (athlete)
Best performances
100 meters
Year_ Result_ World_Rank Location_ Date_
1973 10.15 1st Dakar Apr 15
1974 9.9 1st Westwood Jun 21
1975 10.08 2nd Zurich Aug 20
1976 9.9 4th Gainesville Mar 27
1977 10.13 5th= Düsseldorf Sep 2
1978 10.07 1st= Zurich Aug 16

Question: When was Steve Williams in Zurich and his best result over 100 meters was 10.07?