Historical clue formulations

• Is all over the map — 2026-01-29
• Is inconsistent — 2014-06-18
• Oscillates — 2013-12-26
• Isn't all the same — 2010-06-08
• Fluctuates — 2002-07-09
• Can't be pinned down — 1999-09-02
• Has change — 1995-12-23
• Differs — 1994-07-25