Conversation so far:
What was Mary Decker's career?
Mary Decker was recognized as a world-class runner.
Are there any other interesting aspects about Mary Decker besides being recognized as a world-class runner?
Unable to attend the 1972 Olympics as she was too young, Mary Decker won international acclaim in 1973 with a win in the 800 meters.
When was Mary Decker's first olympics?
Mary Decker was heavily favored to win a gold medal in the 3000 meters run at the 1984 Summer Olympics, held at Los Angeles.
Did Mary Decker win a medal at the Olympics?
Mary Decker has not won a Olympic medal.
Did Mary Decker ever win a medal?
During her career, Mary Decker won gold medals in the 1500 meters and 3000 meters at the 1983 World Championships.
How did Mary Decker do outside the Olympics?
In 1982 Decker-Tabb set six world records, at distances ranging from the mile run to 10,000 meters.

Question: When did tht occur?
Self-contained rewrite: When did Mary Decker set six world records?