| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1979 |
94.3%
|
|
| 1 | voluntary | 19 |
0.9%
|
| 2 | paid overtime | 36 |
1.7%
|
| 3 | part of main work | 51 |
2.4%
|
| 4 | an obligation without compensation | 13 |
0.6%
|
| 5 | other | 1 |
0%
|