| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't Know (Spontaneous) | 25 | 
                                    
                                    22.5%
                                 | 
| 1 | Standard for total energy use | 46 | 
                                    
                                    41.4%
                                 | 
| 2 | Standard for energy use relative to output | 16 | 
                                    
                                    14.4%
                                 | 
| 3 | Standard for energy use relative to other parameters | 24 | 
                                    
                                    21.6%
                                 | 
| Sysmiss | 844 |