| MOUNTAINS AREA | HILLS AREA | FLATLANDS AREA | TURIN AREA | |||||||||||||
| YEARS | N˚ OP. GAUGES | k | σ | μ | N˚ OP. GAUGES | k | σ | μ | N˚ OP. GAUGES | k | σ | μ | N˚ OP. GAUGES | k | σ | μ |
| 1988-1990 | 0 | // | // | // | 1 | 0.0001 | 6.9180 | 46.1939 | 0 | // | // | // | 0 | // | // | // |
| 1989-1991 | 1 | 0.5921 | 9.9683 | 49.0490 | 1 | −1.1263 | 15.8497 | 59.7272 | 0 | // | // | // | 0 | // | // | // |
| 1990-1992 | 1 | 0.4637 | 10.0609 | 51.6365 | 1 | 1.1686 | 4.6151 | 43.9128 | 0 | // | // | // | 0 | // | // | // |
| 1991-1993 | 1 | 0.4860 | 11.5607 | 51.9723 | 2 | 0.6448 | 3.8738 | 44.3295 | 1 | 1.1349 | 1.2440 | 44.7688 | 0 | // | // | // |
| 1992-1994 | 1 | 0.6330 | 12.7494 | 52.8830 | 2 | 0.9239 | 4.3989 | 44.4027 | 1 | 3.6944 | 1.6359 | 44.2414 | 0 | // | // | // |
| 1993-1995 | 1 | 0.7197 | 12.3928 | 51.4016 | 2 | 1.2130 | 3.9712 | 43.4039 | 1 | 0.5346 | 4.0693 | 45.2434 | 0 | // | // | // |
| 1994-1996 | 1 | 0.6662 | 9.7409 | 50.6334 | 2 | 1.1319 | 4.6475 | 43.3616 | 2 | 0.5270 | 4.1872 | 45.3413 | 0 | // | // | // |
| 1995-1997 | 1 | 0.4424 | 6.9481 | 48.5471 | 2 | 0.5931 | 3.6545 | 43.3403 | 3 | 0.4414 | 4.0703 | 45.4754 | 0 | // | // | // |
| 1996-1998 | 1 | 0.4906 | 10.0281 | 52.1733 | 2 | 0.0410 | 5.4640 | 46.3848 | 3 | 0.4618 | 4.6153 | 45.7846 | 0 | // | // | // |
| 1997-1999 | 2 | 0.3530 | 15.7362 | 56.6529 | 2 | −0.4122 | 7.4381 | 49.1545 | 3 | 0.2807 | 5.9352 | 47.9016 | 0 | // | // | // |
| 1998-2000 | 2 | 0.5719 | 18.7639 | 59.2012 | 2 | 0.1887 | 11.2918 | 52.1710 | 3 | 0.1965 | 9.1657 | 50.6755 | 0 | // | // | // |
| 1999-2001 | 3 | 0.5756 | 17.7348 | 57.4726 | 2 | 0.0726 | 13.7285 | 53.8674 | 3 | 0.1442 | 10.4337 | 53.1529 | 0 | // | // | // |
| 2000-2002 | 3 | 0.5904 | 13.2862 | 53.1479 | 2 | −0.0554 | 13.7417 | 54.5280 | 3 | 0.3631 | 10.1725 | 49.4855 | 0 | // | // | // |
| 2001-2003 | 3 | 0.4587 | 10.1366 | 50.1417 | 3 | 0.3232 | 7.0174 | 46.2405 | 4 | 0.5593 | 6.6940 | 46.2676 | 1 | 0.6443 | 5.1380 | 46.7173 |
| 2002-2004 | 3 | 0.4865 | 8.7680 | 48.9325 | 3 | −0.2274 | 9.3349 | 49.6499 | 4 | 0.7418 | 5.5613 | 44.8062 | 1 | 0.5585 | 4.8199 | 45.0039 |
| 2003-2005 | 3 | 0.3881 | 8.2759 | 48.2989 | 4 | 0.4846 | 4.4561 | 44.1046 | 5 | 4.4600 | 1.9910 | 40.8461 | 1 | 0.7731 | 3.6414 | 43.7100 |
| 2004-2006 | 3 | 0.6803 | 11.0680 | 50.0029 | 4 | 0.5120 | 8.7351 | 47.9720 | 5 | 0.7703 | 8.4255 | 46.6926 | 4 | 0.8620 | 5.5792 | 45.3305 |