| Regione | Ritenute | ||
|---|---|---|---|
| Frequenza | Ammontare | Media | |
| Piemonte | 1.311 | 25.023 | 19,09 |
| Valle d'Aosta | 29 | 526 | 18,14 |
| Lombardia | 3.275 | 64.240 | 19,62 |
| Liguria | 414 | 7.912 | 19,11 |
| Trentino Alto Adige (P.A. Trento) | 116 | 1.688 | 14,55 |
| Trentino Alto Adige (P.A. Bolzano) | 193 | 2.575 | 13,34 |
| Veneto | 1.498 | 29.675 | 19,81 |
| Friuli Venezia Giulia | 291 | 4.704 | 16,17 |
| Emilia Romagna | 1.433 | 27.359 | 19,09 |
| Toscana | 864 | 16.442 | 19,03 |
| Umbria | 132 | 2.368 | 17,94 |
| Marche | 333 | 6.273 | 18,84 |
| Lazio | 815 | 18.342 | 22,51 |
| Abruzzo | 109 | 2.347 | 21,53 |
| Molise | 17 | 279 | 16,42 |
| Campania | 382 | 7.980 | 20,89 |
| Puglia | 269 | 4.937 | 18,35 |
| Basilicata | 30 | 587 | 19,57 |
| Calabria | 85 | 1.789 | 21,05 |
| Sicilia | 362 | 6.833 | 18,88 |
| Sardegna | 128 | 2.048 | 16,00 |
| TOTALE | 12.086 | 233.928 | 19,36 |
