| Level | Number | Percentage |
| Not vulnerable | 0 | 0.0 |
| Less vulnerable | 1 | 0.3 |
| Vulnerable | 303 | 97.4 |
| Highly vulnerable | 7 | 2.3 |
| Extremely vulnerable | 0 | 0.0 |
| Total | 311 | 100.0 |