Historical clue formulations

• They have their ups and downs — 2022-11-27
• They go up and down on a playground — 2022-04-26
• School boards? — 2019-08-25
• Vacillates — 2016-05-10
• Vacillates — 2014-08-05
• Teeter-totters — 2013-02-13
• Playground sights — 2005-04-28
• Goes up and down — 2000-02-07
• Teeter-totters — 1999-05-10
• Playground fixtures — 1995-06-02
• Vacillates — 1994-12-13