| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't Know (Spontaneous) | 0 | 
                                    
                                    0%
                                 | 
| 1 | Standard for total energy use | 6 | 
                                    
                                    66.7%
                                 | 
| 2 | Standard for energy use relative to output | 2 | 
                                    
                                    22.2%
                                 | 
| 3 | Standard for energy use relative to other parameters | 1 | 
                                    
                                    11.1%
                                 | 
| Sysmiss | 111 |