| Diameter Class | Frequency |
| 5.1 - 10.1 | 252 |
| 10.1 - 15.1 | 272 |
| 15.1 - 20.1 | 173 |
| 20.1 - 25.1 | 131 |
| 25.1 - 30.1 | 77 |
| 30.1 - 35.1 | 62 |
| 35.1 - 40.1 | 30 |
| 40.1 - 45.1 | 2 |
| 50.1 - 55.1 | 1 |
| 90.1 - 95.1 | 1 |
| 95.1 - 100.1 | 1 |