|
| Q 17 | Q 18 | Q 19 | Q 20 | Q 21 | Q 22 | Q 23 | Q 24 | ||||||||
| Number | PCT | Number | PCT | Number | PCT | Number | PCT | Number | PCT | Number | PCT | Number | PCT | Number | PCT | |
| Very easy | 42 | 20.00% | 1 | 0.48% | 49 | 23.33% | 76 | 36.19% | 50 | 23.81% | 0 | 0.00% | 46 | 21.90% | 76 | 36.19% |
| easy | 74 | 35.24% | 10 | 4.76% | 90 | 42.86% | 73 | 34.76% | 82 | 39.05% | 8 | 3.81% | 94 | 44.76% | 81 | 38.57% |
| average | 65 | 30.95% | 35 | 16.67% | 59 | 28.10% | 46 | 21.90% | 61 | 29.05% | 32 | 15.24% | 56 | 26.67% | 46 | 21.90% |
| difficult | 27 | 12.86% | 94 | 44.76% | 12 | 5.71% | 14 | 6.67% | 17 | 8.10% | 96 | 45.71% | 12 | 5.71% | 7 | 3.33% |
| Very difficult | 2 | 0.95% | 70 | 33.33% | 0 | 0.00% | 1 | 0.48% | 0 | 0.00% | 74 | 35.24% | 2 | 0.95% | 0 | 0.00% |