| Value | Category | Cases | |
|---|---|---|---|
| 1 | reinforced concrete | 14928 |
92.7%
|
| 2 | steel and zinc | 753 |
4.7%
|
| 3 | wood | 69 |
0.4%
|
| 97 | Other | 348 |
2.2%
|
| Sysmiss | 332 |