| Value | Category | Cases | |
|---|---|---|---|
| 1 | none | 396 |
5.3%
|
| 2 | primary | 2898 |
38.6%
|
| 3 | secondary | 3895 |
51.9%
|
| 4 | higher | 306 |
4.1%
|
| 9 | missing/dk | 4 |
0.1%
|