| Value | Category | Cases | |
|---|---|---|---|
| 1 | Clean stones | 1999 |
20.1%
|
| 2 | Cement & stones | 1318 |
13.3%
|
| 3 | Old stones | 338 |
3.4%
|
| 4 | Bricks | 5909 |
59.5%
|
| 5 | Cement | 288 |
2.9%
|
| 6 | other | 72 |
0.7%
|
| Sysmiss | 2 |