| Regione | Ritenute | ||
|---|---|---|---|
| Frequenza | Ammontare | Media | |
| Piemonte | 35.085 | 437.353 | 12,47 |
| Valle d'Aosta | 1.375 | 14.815 | 10,77 |
| Lombardia | 111.250 | 1.575.088 | 14,16 |
| Liguria | 14.456 | 171.327 | 11,85 |
| Trentino Alto Adige (P.A. Trento) | 4.742 | 59.687 | 12,59 |
| Trentino Alto Adige (P.A. Bolzano) | 4.117 | 69.288 | 16,83 |
| Veneto | 43.452 | 587.642 | 13,52 |
| Friuli Venezia Giulia | 9.908 | 122.124 | 12,33 |
| Emilia Romagna | 43.845 | 569.600 | 12,99 |
| Toscana | 36.211 | 406.234 | 11,22 |
| Umbria | 8.040 | 81.836 | 10,18 |
| Marche | 12.979 | 144.046 | 11,10 |
| Lazio | 64.830 | 788.794 | 12,17 |
| Abruzzo | 11.906 | 117.249 | 9,85 |
| Molise | 2.455 | 21.231 | 8,65 |
| Campania | 42.140 | 410.947 | 9,75 |
| Puglia | 27.948 | 280.764 | 10,05 |
| Basilicata | 4.221 | 37.142 | 8,80 |
| Calabria | 13.514 | 108.950 | 8,06 |
| Sicilia | 31.041 | 298.591 | 9,62 |
| Sardegna | 12.488 | 119.171 | 9,54 |
| Non indicata | 8 | 119 | 14,86 |
| TOTALE | 536.011 | 6.421.998 | 11,98 |
