| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Cubic meters | 125 |
86.8%
|
| 2 | Gallons | 19 |
13.2%
|
| 3 | Cubic feet | 0 |
0%
|
| 4 | Other | 0 |
0%
|
| Sysmiss | 18 |