Level 1 | Level 2 | Level 3 | Level 4 | Level 5 | Level 6 | Level 7 | Total | |
---|---|---|---|---|---|---|---|---|
Not difficult | 17.3 | 14.1 | 9.9 | 7.7 | 4.5 | 3.1 | 1.6 | 9.8 |
Mildly difficult | 1.6 | 3.7 | 6.3 | 6.2 | 7.3 | 6.8 | 4.0 | 4.9 |
Moderately difficult | 0.1 | 0.7 | 1.8 | 2.6 | 3.3 | 3.6 | 4.5 | 1.9 |
Considerably difficult | 0.0 | 0.3 | 0.7 | 1.6 | 1.6 | 3.2 | 4.2 | 1.3 |
Extremely difficult | 0.0 | 0.1 | 0.3 | 0.9 | 1.4 | 2.3 | 4.7 | 0.9 |