| Count | Prefix |
|---|---|
| 198 | 6- |
| 8 | 6. |
| 1,327 | 60 |
| 541 | 61 |
| 444 | 62 |
| 373 | 63 |
| 488 | 64 |
| 437 | 65 |
| 1,147 | 66 |
| 383 | 67 |
| 471 | 68 |
| 1,136 | 69 |
| 162 | 6a |
| 146 | 6b |
| 176 | 6c |
| 201 | 6d |
| 110 | 6e |
| 182 | 6f |
| 146 | 6g |
| 74 | 6h |
| 114 | 6i |
| 49 | 6j |
| 71 | 6k |
| 78 | 6l |
| 181 | 6m |
| 107 | 6n |
| 103 | 6o |
| 179 | 6p |
| 28 | 6q |
| 59 | 6r |
| 269 | 6s |
| 331 | 6t |
| 47 | 6u |
| 54 | 6v |
| 89 | 6w |
| 86 | 6x |
| 45 | 6y |
| 26 | 6z |