| Data validità | Prime Rate ABI | |
| Da | A | |
| 31/08/1979 | 14/09/1979 | 15,00 |
| 15/09/1979 | 29/09/1979 | 15,00 |
| 30/09/1979 | 14/10/1979 | 15,00 |
| 15/10/1979 | 30/10/1979 | 15,00 |
| 31/10/1979 | 14/11/1979 | 16,50 |
| 15/11/1979 | 29/11/1979 | 16,50 |
| 30/11/1979 | 14/12/1979 | 16,50 |
| 15/12/1979 | 30/12/1979 | 16,50 |
| 31/12/1979 | 14/01/1980 | 19,50 |
| 15/01/1980 | 30/01/1980 | 19,50 |
| 31/01/1980 | 14/02/1980 | 19,50 |
| 15/02/1980 | 28/02/1980 | 19,50 |
| 29/02/1980 | 14/03/1980 | 19,50 |
| 15/03/1980 | 30/03/1980 | 19,50 |
| 31/03/1980 | 14/04/1980 | 19,50 |
| 15/04/1980 | 29/04/1980 | 19,50 |
| 30/04/1980 | 14/05/1980 | 19,50 |
| 15/05/1980 | 30/05/1980 | 19,50 |
| 31/05/1980 | 14/06/1980 | 19,50 |
| 15/06/1980 | 29/06/1980 | 19,50 |
| 30/06/1980 | 14/07/1980 | 19,50 |
| 15/07/1980 | 30/07/1980 | 19,50 |
| 31/07/1980 | 14/08/1980 | 19,50 |
| 15/08/1980 | 30/08/1980 | 19,50 |
| 31/08/1980 | 14/09/1980 | 19,50 |
| 15/09/1980 | 29/09/1980 | 19,50 |
| 30/09/1980 | 14/10/1980 | 19,50 |
| 15/10/1980 | 30/10/1980 | 19,50 |
| 31/10/1980 | 14/11/1980 | 21,00 |
| 15/11/1980 | 29/11/1980 | 21,00 |
| 30/11/1980 | 14/12/1980 | 21,00 |
| 15/12/1980 | 30/12/1980 | 21,00 |
| 31/12/1980 | 14/01/1981 | 21,00 |
| 15/01/1981 | 30/01/1981 | 21,00 |
| 31/01/1981 | 14/02/1981 | 21,00 |
| 15/02/1981 | 27/02/1981 | 21,00 |
| 28/02/1981 | 14/03/1981 | 21,00 |
| 15/03/1981 | 30/03/1981 | 21,00 |
| 31/03/1981 | 14/04/1981 | 21,00 |
| 15/04/1981 | 29/04/1981 | 21,00 |
| 30/04/1981 | 14/05/1981 | 22,50 |
| 15/05/1981 | 30/05/1981 | 22,50 |
| 31/05/1981 | 14/06/1981 | 22,50 |
| 15/06/1981 | 29/06/1981 | 22,50 |
| 30/06/1981 | 14/07/1981 | 22,50 |
| 15/07/1981 | 30/07/1981 | 22,50 |
| 31/07/1981 | 14/08/1981 | 22,50 |
| 15/08/1981 | 30/08/1981 | 22,50 |
| 31/08/1981 | 14/09/1981 | 22,50 |
| 15/09/1981 | 29/09/1981 | 22,50 |
| 30/09/1981 | 14/10/1981 | 22,50 |