| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Cubic meters | 34 | 
                                    
                                    87.2%
                                 | 
| 2 | Gallons | 3 | 
                                    
                                    7.7%
                                 | 
| 3 | Cubic feet | 0 | 
                                    
                                    0%
                                 | 
| 4 | Other | 2 | 
                                    
                                    5.1%
                                 | 
| Sysmiss | 72 |