| Count | Prefix |
|---|---|
| 69 | zt- |
| 15 | zt. |
| 5 | zt0 |
| 18 | zt1 |
| 4 | zt2 |
| 5 | zt3 |
| 2 | zt4 |
| 2 | zt5 |
| 3 | zt6 |
| 1 | zt7 |
| 4 | zt8 |
| 2 | zt9 |
| 120 | zta |
| 28 | ztb |
| 46 | ztc |
| 22 | ztd |
| 225 | zte |
| 21 | ztf |
| 35 | ztg |
| 57 | zth |
| 82 | zti |
| 22 | ztj |
| 36 | ztk |
| 29 | ztl |
| 45 | ztm |
| 33 | ztn |
| 116 | zto |
| 28 | ztp |
| 10 | ztq |
| 137 | ztr |
| 70 | zts |
| 31 | ztt |
| 36 | ztu |
| 33 | ztv |
| 39 | ztw |
| 18 | ztx |
| 26 | zty |
| 26 | ztz |