Conversation so far:
When did Imran Khan become a captain?
in 1982
Where was Imran Khan a student?
Imran Khan was educated at Aitchison College in Lahore, then the Royal Grammar School Worcester in Worcester, and later at Keble College, Oxford
What was Imran Khan a captain of?
the Pakistan cricket team
When was Imran Khan a captain for the pakistan cricket team?
Imran Khan served as the team's captain intermittently between 1982 and 1992
Did anything interesting happen while Imran Khan was captain?
Imran Khan's career-high as a captain and cricketer came when he led Pakistan to victory in the 1992 Cricket World Cup

Question: When did he retire?
Self-contained rewrite: When did Imran Khan retire?