Historical clue formulations

• Grew less intense — 2024-05-14
• Died down — 2024-05-01
• Quieted down — 2018-11-16
• Died down — 2016-08-14
• Quieted down — 2015-09-18
• Let up — 2015-08-27
• Quieted down — 2015-02-16
• Tapered off — 2014-12-28
• Let up — 2001-03-30
• Let up — 2000-06-25
• Died down — 1996-12-07
• Let up — 1996-02-28