| Category | Frequency | Percent | Valid (%) | Cumulative (%) |
| <10 | 65 | 47.4 | 47.4 | 47.4 |
| 11 - 49 | 25 | 18.2 | 18.2 | 65.7 |
| 50 - 199 | 13 | 9.5 | 9.5 | 75.2 |
| missing | 34 | 24.8 | 24.8 | 100 |
| Total | 137 | 100 | 100 |