| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Cubic meters | 78 |
7.7%
|
| 2 | Gallons | 881 |
87.5%
|
| 3 | Cubic feet | 27 |
2.7%
|
| 4 | Other | 5 |
0.5%
|
| 5 | Liters | 16 |
1.6%
|
| Sysmiss | 1690 |