| Value | Category | Cases | |
|---|---|---|---|
| 1 | none | 6037 |
11.4%
|
| 2 | primary | 22777 |
43%
|
| 3 | secondary + | 20128 |
38%
|
| 4 | higher | 3910 |
7.4%
|
| 9 | missing/dk | 160 |
0.3%
|