| Position | Frequency | Percentage (%) |
| Carpenters | 17 | 18.88 |
| Masons | 29 | 32.23 |
| Plumbers | 15 | 16.66 |
| Electricians | 13 | 14.45 |
| Steel benders | 16 | 17.78 |
| Total | 90 | 100.0 |