| By depth | Min depth difference (m) | Max depth difference (m) | Mean depth difference (m) |
| 0 - 10 | 0 | 7.15 | 2.13 |
| 11 - 20 | 0 | 10.83 | 1.93 |
| 21 - 30 | 0 | 54.97 | 2.85 |
| 31 - 40 | 0 | 17.88 | 3.79 |
| 41 - 50 | 0 | 51.42 | 4.01 |
| 51 - 60 | 0.02 | 26.13 | 3.81 |
| 61 - 70 | 0 | 46.40 | 6.63 |
| 71 - 80 | 0 | 28.73 | 7.08 |
| 81 - 90 | 0.12 | 27.28 | 7.49 |
| 91 - 100 | 0.24 | 21.23 | 6.22 |
| 101 - 110 | 0.09 | 37.02 | 8.34 |
| 111 - 120 | 0.15 | 38.90 | 9.91 |