| Group | Number of primary CS* (n) | Percentage (%) |
| 1 | 363 | 35.9 |
| 2 | 33 | 3.3 |
| 3 | 290 | 28.8 |
| 4 | 28 | 2.8 |
| 5 | - | - |
| 6 | 44 | 4.4 |
| 7 | 50 | 5 |
| 8 | 92 | 9.1 |
| 9 | 15 | 1.5 |
| 10 | 93 | 9.2 |
| Total | 1008 | 100 |