| Modalita' | Descrizione | Codice aggregazione | Note |
| 1 | between 1 and 10 | ||
| 2 | between 1 and 10 | ||
| 3 | between 1 and 10 | ||
| 4 | between 1 and 10 | ||
| 5 | between 1 and 10 | ||
| 6 | between 1 and 10 | ||
| 7 | between 1 and 10 | ||
| 8 | between 1 and 10 | ||
| 9 | between 1 and 10 | ||
| 10 | between 1 and 10 | ||
| 11 | between 11 and 19 persons | ||
| 12 | between 20 and 49 persons | ||
| 13 | 50 persons and more | ||
| 14 | do not know but less than 11 persons | ||
| 15 | do not know but more than 10 persons |