Leeuwarden played 39 league seasons and cup tournaments in the data, 1924 to 1973. Success weighs every finish by how hard that competition was to win; Efficiency is the share of what the club could have won that it did win; Edge compares that with an average participant (×1.00).
| 923 | Académico Viseu (Portugal) | 1.9 |
| 924 | IFK Norrkoping (SWE) | 1.8 |
| 925 | FC Oleksandrija (Ukraine) | 1.8 |
| 926 | Leeuwarden (Netherlands) | 1.8 |
| 927 | KAS Eupen (Belgium) | 1.8 |
| 928 | Naval (Portugal) | 1.8 |
| 929 | Sportivo Barracas (Argentina) | 1.8 |