| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once a week | 624 |
3%
|
| 2 | Once a month | 1540 |
7.3%
|
| 3 | Once a year | 84 |
0.4%
|
| 4 | When there is a need | 2469 |
11.7%
|
| 5 | Other | 44 |
0.2%
|
| 9 | Unspecified | 16334 |
77.4%
|