| Value | Category | Cases | |
|---|---|---|---|
| -99 | NA | 4133 |
88.4%
|
| -97 | Refused | 28 |
0.6%
|
| 1 | It was very difficult | 90 |
1.9%
|
| 2 | It was rather difficult | 113 |
2.4%
|
| 3 | It was rather easy | 142 |
3%
|
| 4 | It was very easy | 169 |
3.6%
|