| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-4 | 2.84/5 | 4.45/5 |
| Vol 5-8 | 2.92/5 | 4.43/5 |
| Vol 9-12 | 2.86/5 | 4.40/5 |
| Vol 13-16 | 2.93/5 | 4.52/5 |
| Vol 17-20 | 3.05/5 | 4.74/5 |
| Vol 21-24 | 3.02/5 | 4.64/5 |
| Vol 25-28 | 3.06/5 | 4.72/5 |
| Vol 29-32 | 3.04/5 | 4.61/5 |
| Vol 33-36 | 2.93/5 | 4.31/5 |
| Vol 37-40 | 2.95/5 | 4.61/5 |
| Vol 41-44 | 2.90/5 | 4.45/5 |
| Vol 45-48 | 2.93/5 | 4.48/5 |
| Vol 49-52 | 2.88/5 | 4.58/5 |
| Vol 53-56 | 2.97/5 | 4.50/5 |
| Vol 57-60 | 2.96/5 | 4.37/5 |
| Vol 61-64 | 2.86/5 | 4.34/5 |
| Vol 65-68 | 2.88/5 | 4.37/5 |
| Vol 69-72 | 2.93/5 | 4.54/5 |
| Vol 73-76 | 2.92/5 | 4.40/5 |
| Vol 77-80 | 2.94/5 | 4.54/5 |
| Vol 81-84 | 3.00/5 | 4.54/5 |
| Vol 85-88 | 3.04/5 | 4.69/5 |
| Vol 89-92 | 2.90/5 | 4.54/5 |
| Vol 93-96 | 2.92/5 | 4.43/5 |
| Vol 97-100 | 2.82/5 | 4.37/5 |
| Overall | 2.94/5 | 4.74/5 |