| Value | Category | Cases | |
|---|---|---|---|
| N1 | 12 |
9.8%
|
|
| N2 | 58 |
47.2%
|
|
| N3 | 33 |
26.8%
|
|
| N4 | 13 |
10.6%
|
|
| N5 | 6 |
4.9%
|
|
| N6 | 1 |
0.8%
|