| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Cubic meters | 19 |
13%
|
| 2 | Gallons | 2 |
1.4%
|
| 3 | Cubic feet | 2 |
1.4%
|
| 4 | Other | 66 |
45.2%
|
| 5 | Liters | 57 |
39%
|
| Sysmiss | 4 |