Historical clue formulations

• Grew disenchanted — 2022-09-13
• Turned bad, as milk — 2015-08-24
• Went bad, as milk — 2015-08-04
• Grew disenchanted — 2011-12-12
• Turned bad — 2009-02-22
• Gone bad — 2005-08-26
• Went bad — 2004-12-08
• Now poor, as relations — 2001-01-02
• Turned bad — 1998-11-14
• Deteriorated, as relations — 1995-06-04