| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Cubic meters | 129 |
78.7%
|
| 2 | Gallons | 3 |
1.8%
|
| 3 | Cubic feet | 8 |
4.9%
|
| 4 | Other | 0 |
0%
|
| 5 | Liters | 24 |
14.6%
|
| Sysmiss | 143 |