Historical clue formulations

• Something usually found in brackets — 2022-08-24
• It may be a high percent for the 1% — 2015-02-08
• Something in brackets — 2015-01-21
• Percentage listed in an I.R.S. booklet — 2004-09-06
• Income earner's concern — 1998-05-14
• It's found according to schedule — 1996-04-06