| Value | Category | Cases | |
|---|---|---|---|
| 1 | Own preparation | 17248 |
87.4%
|
| 2 | Bought | 2157 |
10.9%
|
| 3 | Received for free | 323 |
1.6%
|
| 4 | Other source | 4 |
0%
|
| Sysmiss | 2373 |