| Count | Prefix |
|---|---|
| 205 | 6- |
| 8 | 6. |
| 1,363 | 60 |
| 565 | 61 |
| 469 | 62 |
| 398 | 63 |
| 515 | 64 |
| 459 | 65 |
| 1,197 | 66 |
| 394 | 67 |
| 501 | 68 |
| 1,162 | 69 |
| 168 | 6a |
| 158 | 6b |
| 184 | 6c |
| 208 | 6d |
| 113 | 6e |
| 188 | 6f |
| 151 | 6g |
| 75 | 6h |
| 117 | 6i |
| 50 | 6j |
| 77 | 6k |
| 82 | 6l |
| 189 | 6m |
| 111 | 6n |
| 107 | 6o |
| 186 | 6p |
| 35 | 6q |
| 68 | 6r |
| 281 | 6s |
| 339 | 6t |
| 50 | 6u |
| 55 | 6v |
| 94 | 6w |
| 88 | 6x |
| 47 | 6y |
| 32 | 6z |