| 100% | LEAPDAY | 7 | February 29, an event happens every four years |
| 50% | GENERALELECTION | 15 | It happens every four years |
| 49% | OLYMPICS | 8 | Event once every four years |
| 37% | PUC | 3 | Meeting normally held every four years to discuss issues affecting international mail services (abbr.) |
| 37% | ANNUAL | 6 | Happening every year |
| 36% | ELECTORAL | 9 | College that convenes every four years |
| 36% | OLYMPIC | 7 | Winter games held every four years |
| 36% | ISR | 3 | Country that hosts the Maccabiah Games every four years, the next being next year (abbr.) |
| 36% | OCTENNIAL | 9 | Happening every eight years |
| 36% | DECENNIAL | 9 | Happening every 10 years |
| 36% | BIANNUAL | 8 | Happening every two years |
| 36% | MILLENNIAL | 10 | Happening every 1000 years |
| 36% | FEB | 3 | It changes length every four years: Abbr. |
| 36% | LEAPDAY | 7 | Addition to the calendar every four years |
| 36% | SUPER | 5 | ___ Tuesday (major event in an election year) |
| 35% | ANNIVERSARY | 11 | It happens every year |
| 35% | RYDERCUP | 8 | Competition hosted by the U.S. every four years |
| 35% | WORLDCUP | 8 | International soccer tournament held every four years: 2 wds. |
| 34% | SLAM | 4 | Grand ___ (winning the four major tennis events in one year) |
| 34% | JUBILEE | 7 | A special anniversary of an event; 50 years |
| 34% | ANNUALLY | 8 | Happening once every year |
| 33% | IOWAN | 5 | Midwesterner who sees a lot of presidential candidates every four years |
| 33% | WORLDCUP | 8 | Global soccer tournament that takes place every four years: 2 wds. |
| 33% | BIENNIALS | 9 | Celebrations happening every two years |
| 32% | LEAP | 4 | Year with an extra day in February |
| 31% | OLDS | 4 | Four year-___ (preschool kids) |
| 31% | TAKEPLACE | 9 | Happen, be held (e.g. an event) |
| 29% | LEAP | 4 | Kind of year with an extra day in February |
| 29% | OLYMPICS | 8 | Worldwide sports event held every two years |
| 29% | LEAP | 4 | Year where February has an extra day, say |