Historical clue formulations

• Wowed — 2017-12-11
• Bowled over — 2016-05-18
• Staggered — 2013-09-20
• Blown away — 2009-08-12
• Gobsmacked — 2008-06-18
• Slack-jawed, maybe — 2005-07-01
• Dumbfounded — 2002-11-20
• Dumbfounded — 2001-12-31
• Blown away — 1999-11-27
• Flabbergasted — 1999-09-29
• In shock — 1998-11-14