Historical clue formulations

• "I haven't a clue" — 2026-06-21
• "No clue" — 2021-12-30
• "Your guess is as good as mine" — 2021-06-20
• *shrug* — 2021-06-06
• "I haven't a clue!" — 2021-02-16
• "No idea" — 2019-10-18
• "No clue" — 2016-10-26
• "I haven't the foggiest" — 2015-05-16
• "I dunno" — 2015-03-27
• - — 2014-03-05
• Comment made with a shrug — 2007-07-29
• "Who knows?!" — 2007-02-23
• [ ] — 2006-01-17
• Expression of bafflement — 2001-07-28
• "I have no idea!" — 2001-05-01