| Value | Category | Cases | |
|---|---|---|---|
| 0 | 2 |
0.7%
|
|
| 12 | 1 |
0.4%
|
|
| ? | 238 |
83.8%
|
|
| N1 | 19 |
6.7%
|
|
| N2 | 12 |
4.2%
|
|
| N3 | 7 |
2.5%
|
|
| N4 | 3 |
1.1%
|
|
| N5 | 2 |
0.7%
|