| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Cubic meters | 26 |
37.7%
|
| 2 | Gallons | 0 |
0%
|
| 3 | Cubic feet | 1 |
1.4%
|
| 4 | Other | 42 |
60.9%
|
| Sysmiss | 289 |