| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every year | 434 |
15.2%
|
| 2 | Once every three years | 194 |
6.8%
|
| 3 | Once over three years | 202 |
7.1%
|
| 4 | No increase | 1548 |
54.1%
|
| 5 | Doesn't know | 472 |
16.5%
|
| 6 | No remuneration | 6 |
0.2%
|
| 9 | Missing value | 7 |
0.2%
|