| Value | Category | Cases | |
|---|---|---|---|
| 1 | Natural material | 309 |
24.9%
|
| 2 | Simple material | 134 |
10.8%
|
| 3 | Sophisticated material | 784 |
63.2%
|
| 96 | Other | 2 |
0.2%
|
| Sysmiss | 11 |
0.9%
|