| 2026-04-26 | Like contact lenses for astigmatism |
| 2020-09-15 | Doughnut-shaped |
| 2020-06-03 | Like Life Savers |
| 2019-08-07 | Like an inner tube |
| 2018-05-25 | Doughnut-shaped |
| 2016-07-29 | Doughnutlike |
| 2015-08-07 | Like bagels |
| 2014-07-09 | Cheerio-shaped |
| 2012-08-14 | Life Saver-shaped |
| 2011-08-26 | Like Life Savers |
| 2011-08-21 | Inner tube-shaped |
| 2011-04-24 | Like a bagel |
| 2009-11-12 | Like some fancy soap bubbles |
| 2009-05-05 | Doughnut-shaped |
| 2005-02-19 | Like most washers |
| 2001-07-31 | Doughnut-shaped |
| 2000-06-21 | Like inner tubes |
| 1999-07-04 | Like Life Savers |
| 1999-02-07 | Ring-shaped |
| 1998-01-14 | Doughnut-shaped |
| 1997-06-01 | Doughnutlike |
| 1996-12-11 | Like an inner tube, geometrically |
| 1996-07-03 | Doughnut-shaped |
| 1996-05-30 | Doughnut-shaped |
| 1995-01-01 | Shaped like an inner tube |