| Parameters | Results | ||
| Total | Central | Western | |
| Minimum | 10.0 | 10.0 | 10.0 |
| Maximum | 68.0 | 68.0 | 60.0 |
| Mean | 29.8 | 30.5 | 28.8 |
| Std. Dev. | 8.1 | 7.9 | 8.2 |
| Observations | 295 | 166 | 129 |