| Experience | Frequency | Percent |
| Less than 5 years | 59 | 13.6 |
| Between 5 - 10 years | 124 | 28.5 |
| Between 11 - 20 | 185 | 42.5 |
| More than 20 years | 67 | 15.4 |
| Total | 435 | 100.0 |