| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-4 | 2.52/5 | 4.14/5 |
| Vol 5-8 | 2.62/5 | 4.12/5 |
| Vol 9-12 | 2.54/5 | 4.09/5 |
| Vol 13-16 | 2.62/5 | 4.21/5 |
| Vol 17-20 | 2.73/5 | 4.43/5 |
| Vol 21-24 | 2.72/5 | 4.33/5 |
| Vol 25-28 | 2.74/5 | 4.41/5 |
| Vol 29-32 | 2.73/5 | 4.30/5 |
| Vol 33-36 | 2.62/5 | 4.00/5 |
| Vol 37-40 | 2.64/5 | 4.30/5 |
| Vol 41-44 | 2.59/5 | 4.14/5 |
| Vol 45-48 | 2.62/5 | 4.17/5 |
| Vol 49-52 | 2.57/5 | 4.27/5 |
| Vol 53-56 | 2.66/5 | 4.19/5 |
| Vol 57-60 | 2.64/5 | 4.06/5 |
| Vol 61-64 | 2.55/5 | 4.03/5 |
| Vol 65-68 | 2.57/5 | 4.06/5 |
| Vol 69-72 | 2.62/5 | 4.23/5 |
| Vol 73-76 | 2.61/5 | 4.09/5 |
| Vol 77-80 | 2.62/5 | 4.23/5 |
| Vol 81-84 | 2.69/5 | 4.23/5 |
| Vol 85-88 | 2.74/5 | 4.38/5 |
| Vol 89-92 | 2.59/5 | 4.23/5 |
| Vol 93-96 | 2.61/5 | 4.12/5 |
| Vol 97-100 | 2.51/5 | 4.06/5 |
| Overall | 2.63/5 | 4.43/5 |