Historical clue formulations

• Didn't wax, say — 2022-03-17
• Diminished — 2021-12-01
• Ebbed — 2021-09-28
• Ebbed — 2020-04-01
• Ebbed — 2014-04-13
• Declined — 2013-10-20
• Dropped off — 2012-12-28
• Declined — 2012-04-06
• Lost power — 2010-02-07
• Ebbed — 2009-04-07
• Declined in power — 2008-01-21
• Drawn back — 2007-10-21
• Died down — 2001-03-26
• Fell off — 1999-05-05
• Tapered off — 1999-04-27
• Diminished over time, as the moon — 1998-03-16
• Fell off — 1998-02-13
• Let up — 1998-01-23
• Approached extinction — 1995-08-08
• Lost strength — 1995-07-04
• Dwindled — 1994-03-28