| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Cubic meters | 50 | 
                                    
                                    100%
                                 | 
| 2 | Gallons | 0 | 
                                    
                                    0%
                                 | 
| 3 | Cubic feet | 0 | 
                                    
                                    0%
                                 | 
| 4 | Other | 0 | 
                                    
                                    0%
                                 | 
| 5 | Liters | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 313 |