| Value | Category | Cases | |
|---|---|---|---|
| 1 | Natural material | 591 |
47.7%
|
| 2 | Simple material | 536 |
43.2%
|
| 3 | Sophisticated material | 92 |
7.4%
|
| 96 | Other | 10 |
0.8%
|
| Sysmiss | 11 |
0.9%
|