| Count | Prefix |
|---|---|
| 87 | 20- |
| 9 | 20. |
| 1,159 | 200 |
| 432 | 201 |
| 1,003 | 202 |
| 175 | 203 |
| 134 | 204 |
| 120 | 205 |
| 70 | 206 |
| 64 | 207 |
| 95 | 208 |
| 76 | 209 |
| 42 | 20a |
| 65 | 20b |
| 54 | 20c |
| 54 | 20d |
| 30 | 20e |
| 35 | 20f |
| 33 | 20g |
| 21 | 20h |
| 25 | 20i |
| 11 | 20j |
| 36 | 20k |
| 18 | 20l |
| 123 | 20m |
| 26 | 20n |
| 11 | 20o |
| 46 | 20p |
| 11 | 20q |
| 13 | 20r |
| 90 | 20s |
| 215 | 20t |
| 12 | 20u |
| 17 | 20v |
| 23 | 20w |
| 30 | 20x |
| 26 | 20y |
| 9 | 20z |