| Regione | Ritenute | ||
|---|---|---|---|
| Frequenza | Ammontare | Media | |
| Piemonte | 22.648 | 433.555 | 19,14 |
| Valle d'Aosta | 828 | 14.105 | 17,03 |
| Lombardia | 72.680 | 1.589.031 | 21,86 |
| Liguria | 8.950 | 165.414 | 18,48 |
| Trentino Alto Adige (P.A. Trento) | 3.380 | 64.649 | 19,13 |
| Trentino Alto Adige (P.A. Bolzano) | 2.868 | 71.984 | 25,10 |
| Veneto | 29.423 | 607.186 | 20,64 |
| Friuli Venezia Giulia | 6.436 | 121.573 | 18,89 |
| Emilia Romagna | 28.687 | 570.815 | 19,90 |
| Toscana | 22.504 | 399.127 | 17,74 |
| Umbria | 5.111 | 83.734 | 16,38 |
| Marche | 8.751 | 146.794 | 16,77 |
| Lazio | 38.217 | 766.267 | 20,05 |
| Abruzzo | 7.225 | 116.787 | 16,16 |
| Molise | 1.424 | 21.712 | 15,25 |
| Campania | 23.142 | 379.074 | 16,38 |
| Puglia | 16.937 | 278.995 | 16,47 |
| Basilicata | 2.375 | 34.134 | 14,37 |
| Calabria | 7.462 | 102.641 | 13,76 |
| Sicilia | 18.405 | 285.991 | 15,54 |
| Sardegna | 7.147 | 114.669 | 16,04 |
| TOTALE | 334.600 | 6.368.237 | 19,03 |
