| Value | Category | Cases | |
|---|---|---|---|
| N1 | 2 |
2.2%
|
|
| N2 | 38 |
42.7%
|
|
| N3 | 25 |
28.1%
|
|
| N4 | 14 |
15.7%
|
|
| N5 | 9 |
10.1%
|
|
| N6 | 1 |
1.1%
|