Conversation so far:
When did Imran Khan's Cricket career begin?
Imran Khan debuted at 18 during a 1971 Test series against England.
What team did Imran Khan play on first?
Imran Khan played on Pakistan national cricket team
Did Imran Khan ever play professionally?
After graduating from Oxford, Imran Khan made his home debut for Pakistan in 1976, and played until 1992. He also served as the team's captain intermittently between 1982 and 1992

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