| Value | Category | Cases | |
|---|---|---|---|
| N1 | 258 |
78.2%
|
|
| N2 | 46 |
13.9%
|
|
| N3 | 14 |
4.2%
|
|
| N4 | 6 |
1.8%
|
|
| N5 | 2 |
0.6%
|
|
| N6 | 4 |
1.2%
|