| Years | Frequency (N = 97) | Percentage (%) |
| 2 and below | 10 | 10.31 |
| 3 - 5 | 24 | 24.74 |
| 6 - 8 | 9 | 9.28 |
| 9 - 11 | 4 | 4.12 |
| 12 - 14 | 22 | 22.68 |
| Not Stated | 20 | 20.62 |
| Not Applicable | 8 | 8.25 |